Lantern Hill Quarry (Silex Quarry; U.S. Silica Company Quarry), North Stonington, New London County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| Lantern Hill Quarry (Silex Quarry; U.S. Silica Company Quarry) | Quarry |
| North Stonington | Town |
| New London County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 27' 20'' North , 71° 56' 41'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mashantucket | 299 (2017) | 2.9km |
| Ledyard | 15,212 (2017) | 6.0km |
| Old Mystic | 3,554 (2017) | 7.3km |
| Preston City | 5,000 (2017) | 8.5km |
| Mystic | 4,205 (2017) | 11.4km |
A former quartz mine, opened in 1870s, in a 1.6-km-long and 71m thick quartz lode that also underlies Lantern Hill to the north of the quarry. Since 1994, the land has been owned by the Mashantucket Pequot Tribal Nation. According to Altamura (1995), high-purity silica from here was used for glass making, foundry sand, aquarium sand, swimming pool filters, sandbox sand and architectural aggregate - such as on the concrete faces of the J. F. Kennedy presidential library near Boston. The hydrothermal quartz deposit occurred along rift faults 238 Ma (from primary muscovite, early middle Triassic), 19 Ma before sedimentation in the Triassic-Jurassic Hartford Basin began.
Small quartz crystals can be found in talus along cliffs on 120 m high Lantern Hill.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Kaolinite Formula: Al2(Si2O5)(OH)4 Habit: platy hexagonal Colour: white (commonly stained) Description: tiny crystals in fluid inclusions in quartz were tested, but the mineral is certainly ubiquitous here from the alteration of wall rocks References: |
| ⓘ Plumbogummite Formula: PbAl3(PO4)(PO3OH)(OH)6 Habit: rhombohedral Colour: bluish-green Description: Very microscopic crystals forming crusts on quartz. |
| ✪ Quartz Formula: SiO2 Habit: stubby prisms, some with "corncob" habit, commonly in parallel-growth, doubly-terminated plates Colour: white Description: Crystals can reach 6 cm. |
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Plumbogummite | 8.BL.10 | PbAl3(PO4)(PO3OH)(OH)6 |
| Group 9 - Silicates | |||
| ⓘ | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| H | ⓘ Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| O | Oxygen | |
| O | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| O | ⓘ Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Al | ⓘ Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| Si | Silicon | |
| Si | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Si | ⓘ Quartz | SiO2 |
| P | Phosphorus | |
| P | ⓘ Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| Pb | Lead | |
| Pb | ⓘ Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Avalonia TerraneVolcanic Arc
- Carolinia DomainDomain
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Lantern Hill Quarry, North Stonington, New London County, Connecticut, USA