Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry) | Quarry |
| Haddam | Town |
| Middlesex County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 27' 10'' North , 72° 30' 38'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| East Haddam | 9,042 (2017) | 4.1km |
| Higganum | 1,698 (2017) | 6.3km |
| Chester Center | 1,558 (2017) | 7.5km |
| Moodus | 1,413 (2017) | 7.5km |
| Deep River Center | 2,484 (2017) | 9.9km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Lapidary and Mineral Society of Central Connecticut | Meriden, Connecticut | 26km |
| New Haven Mineral Club | New Haven, Connecticut | 38km |
| Bristol Gem & Mineral Club | Bristol, Connecticut | 44km |
Note: This locality is on residential private property. Collecting is by insured club appointment only, it is not open to casual collecting and is posted no trespassing. Trespassers will be prosecuted.
It is a group of small pegmatite quarries that boasted mineralogy and specimen quality similar to the famous Gillette Quarry across the river in Haddam Neck. Both are zoned pegmatites with cleavelandite and lithium enrichment and feature beryls with clear to pale green cores and pink overgrowths among other minerals.
Major activity apparently began around 1960 because it is mentioned briefly in Schooner (1961) but not at all in Schooner (1958). However, there was activity before then, as Williams (circa 1945) mentions that "At a Feldspar prospect on land of a Mr. Elly near Turkeyhill Road, green tourmaline in muscovite, lepidolite, smoky quartz, fine transparent crystals." Indeed, according to town records, the quarry was once owned by William Ely, and was sold to Ernest McNutt, by his daughter Alice Ely, in 1944. Ernest McNutt rented the quarry to the Hewitts for some years then sold it to them on March 28, 1960.
This is largely substantiated by Gregory (1966):
The outcropping was first worked in the early 1940's for feldspar by Mr. DeLucca who came from Maine. After selling two truck loads of feldspar to the Bon-Ami Company in Manchester, Connecticut, Mr. DeLucca had to give up the operation because of an accident. The old quarry was known as the Saw Mill Quarry. A saw mill was built here in the early 1950's to process the large trees in the area.
In August, 1961, Herbert Hewitt leased the land for mining and prospecting. He found that the dike of pegmatite extended underground quite some distance to the northeast. Mr. Hewitt and his brother have been working the quarry for the last four years, looking for strategic minerals needed for defense and the space age.
In August, 1961, Herbert Hewitt leased the land for mining and prospecting. He found that the dike of pegmatite extended underground quite some distance to the northeast. Mr. Hewitt and his brother have been working the quarry for the last four years, looking for strategic minerals needed for defense and the space age.
In the 1940s, apparently Mr. Ely owned it but Mr. DeLucca worked it.
Herb Hewitt’s gem mine was a popular collecting place during the 1960s and 1970s. To attract rockhounds to this fee collecting site, Herb Hewitt published advertisement fliers. The color ad featured a pile of multi-colored gem beryl rough, much of which was actually from the Roebling Quarry in Upper Merryall, which the Hewitts also worked.
The first technical description of it comes from Barton and Goldsmith (1968):
The Sawmill quarry … is in Haddam on the west flank of Long Hill about 300 feet east of Jail Hill Road and one-half mile north of Turkey Hill Cemetery. It is on a tract of approximately 23 acres owned by Ernest McNutt and under lease in 1963 to Howard Hewitt of Paterson, N.J. There has been small, intermittent production of gem beryl for several years prior to and during 1963.
The quarry area (fig. 32) is underlain by intercalated biotite and hornblende schists and gneisses interrupted by numerous, small pegmatite dikes and sills many of which have been prospected for gem beryl. The country rocks strike approximately north-south and schistosity and banding in the rocks range in dip from vertical to 45° E. The Sawmill Quarry is the only pegmatite on the hill which has been developed.
At the Sawmill Quarry a small sill has been opened by four small prospect pits. The sill strikes N 3° W and dips 45° to 86° E with the foliation of the enclosing rocks. It is exposed for 400 feet along strike and is about 10 feet thick. Because of its eastward dip it has not been explored to any extent downdip, where it runs beneath rising ground forming the west slope of Long Hill (also erroneously called Turkey Hill by local prospectors). The pegmatite is zoned, but poorly exposed in the rubble-strewn pits.
The pegmatite was estimated to contain 0.1 to 0.2 percent beryl. Much of it was beautiful blue, green, white, pink, and multicolored doubly terminated gem and specimen crystals. The multicolored beryl has a green core, and white prism faces grading to pink at either end. Crystals averaged about 1 by 3 inches, but were up to 10 inches long.
The quarry area (fig. 32) is underlain by intercalated biotite and hornblende schists and gneisses interrupted by numerous, small pegmatite dikes and sills many of which have been prospected for gem beryl. The country rocks strike approximately north-south and schistosity and banding in the rocks range in dip from vertical to 45° E. The Sawmill Quarry is the only pegmatite on the hill which has been developed.
At the Sawmill Quarry a small sill has been opened by four small prospect pits. The sill strikes N 3° W and dips 45° to 86° E with the foliation of the enclosing rocks. It is exposed for 400 feet along strike and is about 10 feet thick. Because of its eastward dip it has not been explored to any extent downdip, where it runs beneath rising ground forming the west slope of Long Hill (also erroneously called Turkey Hill by local prospectors). The pegmatite is zoned, but poorly exposed in the rubble-strewn pits.
The pegmatite was estimated to contain 0.1 to 0.2 percent beryl. Much of it was beautiful blue, green, white, pink, and multicolored doubly terminated gem and specimen crystals. The multicolored beryl has a green core, and white prism faces grading to pink at either end. Crystals averaged about 1 by 3 inches, but were up to 10 inches long.
Taber (1971) described and economically assessed the pegmatite for the Hewitts:
The principal pegmatite body...is exposed in two pits totalling about 150 feet in length, up to 30 feet wide, and over 15 feet deep. The widest part, the north end, is split in two by a large horst or sliver of country rock occupying the middle third of the body. The pegmatite trends north-south and dips steeply eastward. Both ends are covered.
The mineralogy is complex: contained minerals are, feldspar (both plagioclase and orthoclose groups of various colors, including white, tan, green, gray, orange, pink), quartz (including smoky), muscovite, tourmaline (black and golden), beryl (green, aquamarine, yellow, colorless), red garnet, red fluorite, lepidolite, and many others not identified by the writer. Many of the beryls are large enough (over 1 inch diameter) and of gem quality, but fractured by blasting.
No commercial product in volume has been produced from this body so far and the writer has doubts if any will be. However, pegmatites are notoriously unpredictable. In general, the feldspar masses are too small and impure, muscovite books and masses are too small and scattered, and the tenor of the beryl is too low and crystals too small for hand cobbing to upgrade any of these products profitably. However, the variety of minerals and the gem qualities of beryl and tourmaline make the pit a favorite for rockhounds. Also, the pegmatite rock itself has been used as a rock garden stone and a market of a few hundred tons a year can be easily developed.
The mineralogy is complex: contained minerals are, feldspar (both plagioclase and orthoclose groups of various colors, including white, tan, green, gray, orange, pink), quartz (including smoky), muscovite, tourmaline (black and golden), beryl (green, aquamarine, yellow, colorless), red garnet, red fluorite, lepidolite, and many others not identified by the writer. Many of the beryls are large enough (over 1 inch diameter) and of gem quality, but fractured by blasting.
No commercial product in volume has been produced from this body so far and the writer has doubts if any will be. However, pegmatites are notoriously unpredictable. In general, the feldspar masses are too small and impure, muscovite books and masses are too small and scattered, and the tenor of the beryl is too low and crystals too small for hand cobbing to upgrade any of these products profitably. However, the variety of minerals and the gem qualities of beryl and tourmaline make the pit a favorite for rockhounds. Also, the pegmatite rock itself has been used as a rock garden stone and a market of a few hundred tons a year can be easily developed.
Herb Hewitt reportedly lived at the quarry during the 1960's and after he passed away in the early 1970's, his brother, Howard, took over trying to promote the quarry for a while and was in his 80's at the time. Howard never worked the quarry as Herb had. The heyday of this locality came to an end when Howard died in 1981. His widow, Emily Hewitt, inherited the land and she used the southern half of the land, #220 Turkey Hill Road, to build the Valley Evangelical Free Church. She sold the northern half, #202 Turkey Hill Road, which contains most if not all of the Hewitt Quarry, to Joseph Mazzotta of Middletown. Aerial photos from 2012 show that the site was abandoned with the pits partially filled in, but most of the dumps remain.
In 2013, James Sipperly introduced Anthony J. Albini and Ray Meyers to owner Joseph Mazzotta. Thereafter, A. J. Albini and Jim Sipperly reviewed the dumps and Joseph Mazzotta started to bulldoze the dumps under A. J. Albini's direction. Since then, several mineral club field trips have been allowed in 2014-15 under owner supervision. As a result, much new material has come to light, including amazonite, several varieties of beryl, masses of deep red to almost black chlorophane, and pockets with smoky quartz.
In 2015, several collectors found the pink, fibrous, lithium-rich muscovite variety "schernikite", first described at the Gillette quarry, in a miarolitic cavity with elbaite to 15 cm, including the "Trick or Treat Pocket" on October 31. This rare muscovite variety is one of many ways the mineralization at Hewitt is similar to that at the Gillette Quarry, which is located only 2.7 miles directly north. A smaller pocket of smoky quartz and microcline coated by pink cookeite was found on August 4, 2024.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
33 valid minerals.
Detailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) Habit: fine granular, to coarse blocky Colour: white to very pale blue when granular and wet Description: Stugard (1958) established through sampling various pegmatites that albite is the plagioclase of the Middletown Pegmatite District, though this location was not sampled it is in the district. An aplitic zone consists primarily of this mineral, with an intermediate zone containing coarser, blocky anhedral crystals. |
| ⓘ Albite var. Cleavelandite Formula: Na(AlSi3O8) Habit: platy Colour: white to very pale blue Description: Found in scattered areas that grade into the aplitic zone. References: |
| ⓘ Almandine Formula: Fe2+3Al2(SiO4)3 |
| ⓘ Annite Formula: KFe2+3(AlSi3O10)(OH)2 Description: fka biotite, mostly as grains in the surrounding gneiss |
| ⓘ Bavenite Formula: Ca4Be2Al2Si9O26(OH)2 Description: Alteration of beryl. |
| ⓘ Bertrandite Formula: Be4(Si2O7)(OH)2 Habit: complex micro-crystals Colour: colorless Description: Typically as secondary micro-crystals from alteration of beryl. |
| ✪ Beryl Formula: Be3Al2(Si6O18) Habit: anhedral to subhedral elongated prisms, terminations rounded to partially pyramidal with pinacoid, or fully pinacoidal. Colour: colorless, pale green, blue, pink Description: Crystals to several cm, best are found in the aplitic zone, or at the intermediate/quartz core zone contact. |
| ⓘ Beryl var. Aquamarine Formula: Be3Al2Si6O18 Habit: elongated prisms with pinacoid terminations Colour: blue Description: Mostly gem rough to subhedral crystals usually frozen in matrix, especially in the intermediate zone. References: |
| ⓘ Beryl var. Goshenite Formula: Be3Al2(Si6O18) Habit: elongated prisms as cores of morganite crystals Colour: colorless Description: Subhedral crystals to several cm, in aplitic zone or near the intermediate/quartz core zone boundary. References: |
| ⓘ Beryl var. Heliodor Formula: Be3Al2(Si6O18) Description: Subhedral crystals to several cm, in aplitic zone or near the intermediate/quartz core zone boundary. |
| ⓘ Beryl var. Morganite Formula: Be3Al2(Si6O18) Habit: elongated prisms as overgrowths on goshenite or pale green beryl, terminated by pedion and pyramidal faces Colour: pink Description: Subhedral crystals to several cm, in aplitic zone or near the intermediate/quartz core zone boundary. |
| ⓘ Bismuthinite Formula: Bi2S3 Habit: acicular Colour: metallic gray Description: Irregular masses or crystals that may be all or mostly altered to bismutite or perhaps bismite. |
| ⓘ Bismutite Formula: (BiO)2CO3 Habit: massive replacement of bismuthinite Colour: white, pale yellow, green Description: Masses several cm across found in the aplitic zone of the pegmatite. Wet chemical analysis showed it is all bismutite with no remnants of the original mineral, which did not have the elongated crystal habit typical of bismuthinite. X-ray analyses of similar specimens from the area proved to be all bismutite despite the color variation. |
| ⓘ Bismutotantalite Formula: BiTaO4 Habit: anhedral Colour: gray exterior, brown interior Description: Very small grains to a couple of mm in matrix of albite, muscovite, quartz, elbaite. Analyzed in 2017 by Peter Cristofono and Tom Mortimer. References: |
| ✪ 'Calciomicrolite' Habit: octahedron modified by dodecahedron, trapezohedron and hexahedron. Colour: dark yellow green, brown, black Description: Typically as micro-crystals but can reach 8mm, most easily found in the aplitic zone, but in the intermediate zone and core margin also.
At least 4 crystals (tiny subhedral grains, 2 octahedral microcrystals and a single 21mm fragment) have been analyzed via SEM-EDS and in all cases the best match is calciomicrolite, with very little Na or Nb. Zones within the 21mm fragment were also analyzed and showed a Ca-Ta oxide with minor Nb (and no Na or Ti)...this could also be microlite, or perhaps calciotantite, which can occur as an inclusion in microlite. |
| ⓘ Chalcopyrite Formula: CuFeS2 Habit: Massive Colour: brassy with iridescent coating Description: Massive in annite schist near the pegmatite contact, with secondary pyrite and sphalerite. References: |
| ⓘ 'Chlorite Group' References: |
| ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series' Colour: black Description: Typically as small crystals. References: |
| ⓘ Cookeite Formula: (LiAl4◻)[AlSi3O10](OH)8 Habit: micro globules and aggregates Colour: pale yellow, rarely rosy Description: mostly found waxy aggregates and globules with schernikite and elbaite in miarolitic cavities References: |
| ⓘ Diopside Formula: CaMgSi2O6 Habit: elongated narrow prismatic Colour: gray-green Description: Fan-shaped aggregates of radiating crystals about 1-1.5 cm wide and 15 cm long frozen in quartz. Found in a glacial boulder near the quarry. References: |
| ✪ Elbaite Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) Habit: elongated prisms, mostly non-terminated. Crystals from miarolitic cavities show mostly trigonal pyramidal terminations (antilogous pole) with capillary parallel growth. A few show pedion terminations (analogous pole). Colour: dark green prisms. Terminated crystals show lighter green near analogous pole, thin blue cap at the antilogous pole. Description: Very dark, commonly hard to tell from schorl, or as an overgrowth on it. On Halloween 2015 a miarolitic cavity was opened that contained terminated elbaite/schorl crystals to 15 cm enveloped by crystalline schernikite aggregates. Shelton (1967) noted "rubellite". |
| ⓘ Fluorapatite Formula: Ca5(PO4)3F Habit: massive to subhedral prismatic Colour: pale gray-green Fluorescence: yellow in SW Description: Usually as masses or small crystals in the aplitic zone. References: |
| ⓘ Fluorite Formula: CaF2 Colour: red Description: see variety chlorophane for details |
| ✪ Fluorite var. Chlorophane Formula: CaF2 Habit: anhedral to modified octahedral Colour: micro crystals colorless to pale pink with purple zones at the tips, larger crystals and masses are red to reddish black Fluorescence: blue-green in SW, purple in LW, green phosphorescence Description: Crystals mostly micros in pockets in the aplitic zone, larger crystals to a few cm rare, but they typically crumble into fragments when found. Typically as irregular masses to 10 cm. SW fluorescence is eventually lost if left exposed to any light, so immediately place and keep any finds in an opaque container to preserve this property. |
| ⓘ 'K Feldspar' Habit: wedge-shaped Colour: white Description: In hexagonal voids from dissolved beryl, with clays and bertrandite. References: |
| ⓘ 'K Feldspar var. Adularia' Formula: KAlSi3O8 Habit: wedge-shaped Colour: white Description: In hexagonal voids from dissolved beryl, with clays and bertrandite. References: |
| ⓘ 'Lepidolite' Habit: granular Colour: pink Description: Thin bands in massive pollucite, scattered in aplitic zone. |
| ⓘ Maghemite Formula: (Fe3+0.67◻0.33)Fe3+2O4 Habit: massive Colour: brown Description: Alteration of magnetite found on biotite gneiss in the rock quarry uphill from the pegmatite. Referenced and photographed by Weissmand and Nikischer of Excalibur Mineral Corp. Harold Moritz collection contains a similar specimen purchased from them. |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 Habit: massive Colour: black Description: In layers in biotite gneiss uphill from the pegmatite quarry. Some alteration to maghemite. |
| ⓘ 'Manganese Oxides' References: |
| ⓘ 'Manganese Oxides var. Manganese Dendrites' References: |
| ⓘ Meta-autunite Formula: Ca(UO2)2(PO4)2 · 6H2O Habit: flaky, encrustation Colour: yellow-green Fluorescence: bright green under SW UV Description: flaky crystals surrounding uraninite References: |
| ⓘ Metatorbernite Formula: Cu(UO2)2(PO4)2 · 8H2O Habit: tabular Colour: emerald green Description: Coating of mm-scale micro-crystals on one face of a 5-6 cm fragment of pegmatite from the dump. References: |
| ⓘ Microcline Formula: K(AlSi3O8) Habit: massive to subhedral Colour: tan to pale green or yellow-green Description: Stugard (1958) established through sampling various pegmatites that microcline is the K-feldspar of the Middletown Pegmatite District, though this location was not sampled. Much of it is rock forming grains, except at the intermediate/quartz core zone boundary where inward oriented, subhedral prismatic crystals to 30 cm grade into the amazonite variety. |
| ✪ Microcline var. Amazonite Formula: K(AlSi3O8) Habit: massive to subhedral prismatic Colour: pale green Description: Concentrated at the intermediate/quartz core zone boundary where inward oriented, subhedral prismatic crystals reach 30 cm. Color is generally pale and patchy within crytals, but some zones approach aqua. |
| ✪ 'Microlite Group' Formula: A2-mTa2X6-wZ-n Habit: octahedron modified by dodecahedron, hexahedron and trapezohedron Colour: dark yellow-green, brown, black Description: Typically as micro-crystals but can reach 8mm, most easily found in the aplitic zone, but in the intermediate zone and core margin also. Four specimens have been analyzed via SEM-EDS and proved to be calciomicrolite with little to no Na or Nb. |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Colour: silvery to pale brown or green Description: Generally as part of the rock and not very collectible here. References: |
| ⓘ Muscovite var. Illite Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2 Habit: earthy Colour: pastel pink Description: clay-like masses in small voids in the aplitic zone of the pegmatite. References: |
| ✪ Muscovite var. Schernikite Formula: KAl2(AlSi3O10)(OH)2 Habit: Fibrous crystals with rhombic cross-section formed in parallel growths that resemble waxy columns. Colour: Pale pink. Description: Commonly found as thin coatings on feldspar frozen in the mineralogically complex zone, and rarely as crystalline aggregates in miarolitic cavities with elbaite. Most of the "lepidolite" (none have been analyzed) from here is likely schernikite. References: |
| ⓘ Opal Formula: SiO2 · nH2O Habit: encrustations Colour: colorless Fluorescence: green under SW Description: As coatings only readily visible when fluorescing under SW UV light. References: |
| ⓘ Opal var. Opal-AN Formula: SiO2 · nH2O Habit: encrustations Colour: colorless Fluorescence: green under SW Description: As coatings only readily visible when fluorescing under SW UV light. References: |
| ⓘ Phlogopite Formula: KMg3(AlSi3O10)(OH)2 Description: reported as a small amount, probably in the enclosing schist at pegmatites are notoriously Mg-poor. |
| ⓘ Pollucite Formula: (Cs,Na)2(Al2Si4O12) · 2H2O Habit: massive, granular Colour: white Description: White masses identified by the inclusion of thin bands of lepidolite. |
| ⓘ Pyrite Formula: FeS2 Habit: massive Colour: pale brassy Description: Mostly massive in annite schist near the pegmatite contact, with secondary chalcopyrite and sphalerite. Tiny crystals lining little vugs where pyrite filled voids left by weathered-out albite. Surrounds almandine and tourmaline crystals in the schist. References: |
| ✪ Quartz Formula: SiO2 Habit: massive to euhedral prismatic or scepter overgrowths Colour: smoky Description: Mostly massive as part of the pegmatite matrix, but good pocket crystals are found at the outer edge of the quartz core zone near the amazonite crystals. Crystals to over 30 cm can form parts of the pocket walls, though most loose crystals are up to several cm. Can be doubly-terminated or complex scepters. |
| ✪ Quartz var. Smoky Quartz Formula: SiO2 Habit: anhedral to euhedral prismatic or scepter overgrowths Colour: smoky brown Description: Mostly massive as part of the pegmatite matrix, but excellent pocket crystals are found at the outer edge of the quartz core zone near the amazonite crystals. Transparent crystals to over 30 cm, though most loose crystals are up to several cm. They can be doubly-terminated or complex scepters. |
| ⓘ Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) Habit: elongated prisms Colour: black Description: Grades into very dark elbaite. Crystals rarely terminated, can reach 10 cm. References: |
| ⓘ Spessartine Formula: Mn2+3Al2(SiO4)3 Habit: trapezohedral Colour: deep red to orange-red Description: Usually found as tiny orange crystals in the aplitic zone. One larger, reddish crystal analysed by XRF by Harold Moritz has an Mn to Fe ratio of 52/48%. |
| ⓘ Sphalerite Formula: ZnS Habit: massive Colour: red-brown with blue coating Description: Massive in annite schist near the pegmatite contact, with secondary pyrite and chalcopyrite. References: |
| ⓘ Tantalite-(Mn) Formula: Mn2+Ta2O6 Habit: Tabular prism Colour: very dark maroon Description: Slightly translucent microcrystals to a few mm in granular albite zone. References: |
| ⓘ Topaz ? Formula: Al2(SiO4)(F,OH)2 Colour: blue or colorless Description: Usually well formed blueish to clear crystals in small cavities to 2cm in width. However, intensive collecting after 2013 has not turned up any topaz, but plenty of albite and cleavelandite that fits this description. |
| ⓘ Uraninite Formula: UO2 Habit: crudely octahedral Colour: black Description: small crystals a few mm surrounded by iron hydroxide stain and flaky meta-autunite crystals. References: |
| ⓘ Zircon Formula: Zr(SiO4) References: |
| ⓘ Zircon var. Cyrtolite Formula: Zr[(SiO4),(OH)4] Description: Tiny crystals usually in the aplitic zone. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Bismuthinite | 2.DB.05 | Bi2S3 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Fluorite var. Chlorophane | 3.AB.25 | CaF2 |
| ⓘ | 3.AB.25 | CaF2 | |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | 'Microlite Group' | 4.00. | A2-mTa2X6-wZ-n |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Maghemite | 4.BB.15 | (Fe3+0.67◻0.33)Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Smoky Quartz | 4.DA.05 | SiO2 |
| ⓘ | Opal var. Opal-AN | 4.DA.10 | SiO2 · nH2O |
| ⓘ | 4.DA.10 | SiO2 · nH2O | |
| ⓘ | Tantalite-(Mn) | 4.DB.35 | Mn2+Ta2O6 |
| ⓘ | Bismutotantalite | 4.DE.30 | BiTaO4 |
| ⓘ | Uraninite | 4.DL.05 | UO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Bismutite | 5.BE.25 | (BiO)2CO3 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| ⓘ | Meta-autunite | 8.EB.10 | Ca(UO2)2(PO4)2 · 6H2O |
| ⓘ | Metatorbernite | 8.EB.10 | Cu(UO2)2(PO4)2 · 8H2O |
| Group 9 - Silicates | |||
| ⓘ | Almandine | 9.AD.25 | Fe2+3Al2(SiO4)3 |
| ⓘ | Spessartine | 9.AD.25 | Mn2+3Al2(SiO4)3 |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | var. Cyrtolite | 9.AD.30 | Zr[(SiO4),(OH)4] |
| ⓘ | Topaz ? | 9.AF.35 | Al2(SiO4)(F,OH)2 |
| ⓘ | Bertrandite | 9.BD.05 | Be4(Si2O7)(OH)2 |
| ⓘ | Beryl var. Aquamarine | 9.CJ.05 | Be3Al2Si6O18 |
| ⓘ | 9.CJ.05 | Be3Al2(Si6O18) | |
| ⓘ | var. Morganite | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | var. Heliodor | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | var. Goshenite | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Elbaite | 9.CK.05 | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
| ⓘ | Bavenite | 9.DF.25 | Ca4Be2Al2Si9O26(OH)2 |
| ⓘ | Muscovite var. Illite | 9.EC.15 | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
| ⓘ | 9.EC.15 | KAl2(AlSi3O10)(OH)2 | |
| ⓘ | var. Schernikite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Annite | 9.EC.20 | KFe2+3(AlSi3O10)(OH)2 |
| ⓘ | Phlogopite | 9.EC.20 | KMg3(AlSi3O10)(OH)2 |
| ⓘ | Cookeite | 9.EC.55 | (LiAl4◻)[AlSi3O10](OH)8 |
| ⓘ | Microcline var. Amazonite | 9.FA.30 | K(AlSi3O8) |
| ⓘ | 9.FA.30 | K(AlSi3O8) | |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Cleavelandite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Pollucite | 9.GB.05 | (Cs,Na)2(Al2Si4O12) · 2H2O |
| Unclassified | |||
| ⓘ | 'K Feldspar var. Adularia' | - | KAlSi3O8 |
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Lepidolite' | - | |
| ⓘ | 'Columbite-(Fe)-Columbite-(Mn) Series' | - | |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Manganese Oxides var. Manganese Dendrites' | - | |
| ⓘ | '' | - | |
| ⓘ | 'Calciomicrolite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| H | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| H | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| H | ⓘ Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| H | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Opal var. Opal-AN | SiO2 · nH2O |
| H | ⓘ Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
| H | ⓘ Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| H | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Opal | SiO2 · nH2O |
| H | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
| H | ⓘ Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| H | ⓘ Muscovite var. Schernikite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| H | ⓘ Zircon var. Cyrtolite | Zr[(SiO4),(OH)4] |
| Li | Lithium | |
| Li | ⓘ Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| Li | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| Be | Beryllium | |
| Be | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| Be | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Be | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| Be | ⓘ Beryl | Be3Al2(Si6O18) |
| Be | ⓘ Beryl var. Morganite | Be3Al2(Si6O18) |
| Be | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| Be | ⓘ Beryl var. Goshenite | Be3Al2(Si6O18) |
| B | Boron | |
| B | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| C | Carbon | |
| C | ⓘ Bismutite | (BiO)2CO3 |
| O | Oxygen | |
| O | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Microcline var. Amazonite | K(AlSi3O8) |
| O | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| O | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| O | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| O | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| O | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| O | ⓘ Bismutotantalite | BiTaO4 |
| O | ⓘ Bismutite | (BiO)2CO3 |
| O | ⓘ Beryl | Be3Al2(Si6O18) |
| O | ⓘ Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| O | ⓘ Diopside | CaMgSi2O6 |
| O | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| O | ⓘ Opal var. Opal-AN | SiO2 · nH2O |
| O | ⓘ Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
| O | ⓘ Tantalite-(Mn) | Mn2+Ta2O6 |
| O | ⓘ Maghemite | (Fe3+0.67◻0.33)Fe23+O4 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| O | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Beryl var. Morganite | Be3Al2(Si6O18) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Opal | SiO2 · nH2O |
| O | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
| O | ⓘ Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Muscovite var. Schernikite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Quartz var. Smoky Quartz | SiO2 |
| O | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| O | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| O | ⓘ Uraninite | UO2 |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| O | ⓘ Zircon var. Cyrtolite | Zr[(SiO4),(OH)4] |
| O | ⓘ Beryl var. Goshenite | Be3Al2(Si6O18) |
| O | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| O | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| F | Fluorine | |
| F | ⓘ Fluorite var. Chlorophane | CaF2 |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| F | ⓘ Fluorite | CaF2 |
| F | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | ⓘ Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| Na | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | ⓘ Diopside | CaMgSi2O6 |
| Mg | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Microcline var. Amazonite | K(AlSi3O8) |
| Al | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Al | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| Al | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| Al | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Al | ⓘ Beryl | Be3Al2(Si6O18) |
| Al | ⓘ Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| Al | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘ Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Beryl var. Morganite | Be3Al2(Si6O18) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
| Al | ⓘ Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| Al | ⓘ Muscovite var. Schernikite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Al | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Al | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| Al | ⓘ Beryl var. Goshenite | Be3Al2(Si6O18) |
| Al | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| Si | Silicon | |
| Si | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Microcline var. Amazonite | K(AlSi3O8) |
| Si | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Si | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| Si | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| Si | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Si | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| Si | ⓘ Beryl | Be3Al2(Si6O18) |
| Si | ⓘ Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| Si | ⓘ Diopside | CaMgSi2O6 |
| Si | ⓘ Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Opal var. Opal-AN | SiO2 · nH2O |
| Si | ⓘ Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Beryl var. Morganite | Be3Al2(Si6O18) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Opal | SiO2 · nH2O |
| Si | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
| Si | ⓘ Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Schernikite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Quartz var. Smoky Quartz | SiO2 |
| Si | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Si | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| Si | ⓘ Zircon var. Cyrtolite | Zr[(SiO4),(OH)4] |
| Si | ⓘ Beryl var. Goshenite | Be3Al2(Si6O18) |
| Si | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| P | Phosphorus | |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| P | ⓘ Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| P | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| S | Sulfur | |
| S | ⓘ Bismuthinite | Bi2S3 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| K | ⓘ Microcline var. Amazonite | K(AlSi3O8) |
| K | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Schernikite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Ca | ⓘ Fluorite var. Chlorophane | CaF2 |
| Ca | ⓘ Diopside | CaMgSi2O6 |
| Ca | ⓘ Fluorapatite | Ca5(PO4)3F |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| Mn | Manganese | |
| Mn | ⓘ Tantalite-(Mn) | Mn2+Ta2O6 |
| Mn | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Mn | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Fe | Iron | |
| Fe | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Fe | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Maghemite | (Fe3+0.67◻0.33)Fe23+O4 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Fe | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
| Zr | ⓘ Zircon var. Cyrtolite | Zr[(SiO4),(OH)4] |
| Nb | Niobium | |
| Nb | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Cs | Caesium | |
| Cs | ⓘ Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| Ta | Tantalum | |
| Ta | ⓘ Bismutotantalite | BiTaO4 |
| Ta | ⓘ Tantalite-(Mn) | Mn2+Ta2O6 |
| Ta | ⓘ Microlite Group | A2-mTa2X6-wZ-n |
| Bi | Bismuth | |
| Bi | ⓘ Bismutotantalite | BiTaO4 |
| Bi | ⓘ Bismuthinite | Bi2S3 |
| Bi | ⓘ Bismutite | (BiO)2CO3 |
| U | Uranium | |
| U | ⓘ Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| U | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| U | ⓘ Uraninite | UO2 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Ganderia DomainDomain
- GranderiaPassive Margin
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Hewitt Gem Quarry, Haddam, Middlesex County, Connecticut, USA