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Quartz locality, Moosup, Plainfield, Windham Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 43' 4'' North , 71° 51' 34'' West
Latitude & Longitude (decimal): 41.71778,-71.85944
GeoHash:G#: drkvkf3x9
Köppen climate type:Cfb : Temperate oceanic climate


Quartz crystals formed in cavities in brecciated Plainville Formation quartzite. Brecciation was caused by the Snake Meadow Brook Fault, related to the Lantern Hill Fault, which was silicified 238 Ma (Middle Triassic) (Altamura, 1995).

The main exposures occur along the former railroad bed (Coventry Greenway) extending northeast from Brunswick Avenue, parallel to the east side of the Moosup River and south of State Route 14. The site is a railroad cut, not a "quarry" (Robinson and King, 1989), nor is it correctly called "Diamond Ledge", which refers to a similar quartz occurrence in West Stafford, Connecticut. Discovered in the early 1980s, after much of the slope was dug, private property encroached upon, and spoil dumped in the pathway, the state Department of Energy and Environmental Protection covered and shored up the exposure and as of 2010 there is very little left to collect.

Reportedly abuse of this state locale (and adjacent private property) led to the permit system now required for any collection on state land, which is limited to only 3 places - not including this one.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Habit: tabular
Colour: white
Description: Small crystals in a vein cross-cutting gray quartzite, with quartz and hematite.
Reference: Harold Moritz collection
Goethite
Formula: α-Fe3+O(OH)
Colour: dark brown to yellow
Description: Massive to earthy to crudely columnar in structure, formed within brecciated pockets long after the quartz crystallized.
Reference: Ed Force collection
Hematite
Formula: Fe2O3
Habit: tabular
Colour: black metallic
Description: Small crystals in a vein cross-cutting gray quartzite, with quartz and albite.
Reference: Harold Moritz collection
Quartz
Formula: SiO2
Habit: short to elongated prisms, scepter overgrowths
Colour: colorless to milky, pale purple
Description: Voids of all sizes host subparallel, prismatic quartz on the walls, which grew from grains in the brecciated quartzite. Crystals can be colorless and clear or milky with parasitic "corn-cob" crystals. Scepter overgrowths, some amethystine, also occur. Crystals can reach 8 cm.
Reference: Clark, Bill. (2001). Connecticut Quartz: Interesting Specimens from a former Collecting Site. Rock & Gem: 31(8).
Quartz var: Amethyst
Formula: SiO2
Habit: short to complex scepter overgrowths on prismatic quartz
Colour: light purple, zoned
Description: As scepter overgrowths on other quartz.
Reference: Clark, Bill. (2001). Connecticut Quartz: Interesting Specimens from a former Collecting Site. Rock & Gem: 31(8).
Quartz var: Milky Quartz
Formula: SiO2
Habit: short to elongated prisms, scepter overgrowths
Colour: milky white
Description: Voids of all sizes host subparallel, prismatic quartz on the walls, which grew from grains in the brecciated quartzite. Crystals can be colorless and clear or milky with parasitic "corn-cob" crystals. Scepter overgrowths also occur. Crystals can reach 8 cm.
Reference: Clark, Bill. (2001). Connecticut Quartz: Interesting Specimens from a former Collecting Site. Rock & Gem: 31(8).

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Milky Quartz4.DA.05SiO2
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Quartz
var: Amethyst
-SiO2
var: Milky Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
OOxygen
O AlbiteNa(AlSi3O8)
O Quartz (var: Amethyst)SiO2
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O Quartz (var: Milky Quartz)SiO2
O QuartzSiO2
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al AlbiteNa(AlSi3O8)
SiSilicon
Si AlbiteNa(AlSi3O8)
Si Quartz (var: Amethyst)SiO2
Si Quartz (var: Milky Quartz)SiO2
Si QuartzSiO2
FeIron
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Robinson, George and Vandall T. King. (1989). What's New in Minerals? Sixteenth Annual Rochester Academy of Science Mineralogical Symposium. Mineralogical Record: 20(5):390.
Altamura, Robert J. (1995), Tectonics, Wall-Rock Alteration and Emplacement History of the Lantern Hill Giant Quartz Lode, Avalonian Terrane, Southeastern Connecticut. Trip E in Guidebook for Fieldtrips in Eastern Connecticut and the Hartford Basin. Northeast Section Geological Society of America 30th Annual Meeting. Department of Environmental Protection Guidebook number 7.
Clark, Bill. (2001). Connecticut Quartz: Interesting Specimens from a former Collecting Site. Rock & Gem: 31(8).


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