Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Tidewater feldspar quarry, Haddam Neck, Haddam, Middlesex County, Connecticut, USAi
Regional Level Types
Tidewater feldspar quarryQuarry
Haddam Neck- not defined -
HaddamTown
Middlesex CountyCounty
ConnecticutState
USACountry

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Latitude & Longitude (WGS84):
41° 29' 54'' North , 72° 31' 24'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Higganum1,698 (2017)2.8km
Moodus1,413 (2017)6.1km
East Haddam9,042 (2017)7.2km
East Hampton2,691 (2017)8.8km
Lake Pocotopaug3,436 (2017)11.1km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Lapidary and Mineral Society of Central ConnecticutMeriden, Connecticut24km
New Haven Mineral ClubNew Haven, Connecticut40km
Bristol Gem & Mineral ClubBristol, Connecticut40km
Mindat Locality ID:
274358
Long-form identifier:
mindat:1:2:274358:8
GUID (UUID V4):
0


A quarry in granite pegmatite on the west side of the riverside promontory known as Rock Landing because of the former ferry landing there. The Tidewater Feldspar Co. had a grinding mill here also, where it processed microcline from the adjacent pegmatite, but mostly from the Rock Landing Quarry, located about 4000 feet to the north of the mill. They may have prospected, or purchased, microcline from a few nearby, poorly documented pegmatite prospects such as on the Knudsen property, or the one at the SE tip of a promontory on the river about 1000 feet upstream of the mill.

The company was established in 1917 (Hartford Courant, 1917) and in 1920 "shipped several tons of ground spar to New York by motor trucks on the new state road" (Connecticut River Advertiser, 1920). The cost of labor must have reduced from a high during The Great War, which shut many quarries and mills down. The company had an advertisement in the 1928 Haddam Neck Fair program, and was given brief mention by Rice and Foye (1927): "This dike was once quarried for its feldspar, and a grinding mill was erected by the Tidewater Feldspar Company near the quarry." However, The Great Depression must have hit it hard because the property was put up for auction on Feb. 28, 1931 (Hartford Courant, 1931). It was apparently purchased by Mr. Worth of Middletown, who operated other feldspar quarries in nearby East Hampton. Reportedly new equipment was being installed at the mill by Sterling C. Gillette, who was reopening the nearby Gillette Quarry for feldspar mining, and feldspar was to be sent to Bon Ami Company in South Manchester, Conn. (The East Hampton News, 1932). Aside from some concrete foundation remnants, the mill is long gone and the site is now very overgrown. When it was removed is uncertain. None of its operations are mentioned in Cameron et al's very comprehensive WWII-era "Pegmatite Investigations 1942-45 New England", so it must have been gone before then. Perhaps it was a victim of flooding during the devastating Hurricane of 1938? Because it is not described in the earlier government feldspar mine surveys by Baston (1910) and Watts (1916) either, its existence was relegated to obscurity.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


5 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
References:
Magnetite
Formula: Fe2+Fe3+2O4
Habit: Octahedral
Colour: black
Description: Microscopic crystals.
Microcline
Formula: K(AlSi3O8)
References:
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
References:
Quartz
Formula: SiO2
References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Microcline9.FA.30K(AlSi3O8)
Albite9.FA.35Na(AlSi3O8)

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
OOxygen
O AlbiteNa(AlSi3O8)
O MagnetiteFe2+Fe23+O4
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al AlbiteNa(AlSi3O8)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si AlbiteNa(AlSi3O8)
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
FeIron
Fe MagnetiteFe2+Fe23+O4

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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