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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Pyrite from
Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA


07188660017408776498274.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
08087990017272019319411.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
00918400017272019335303.jpg
Pyrite

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
01187580017361079348905.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
07188660017408776498274.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
06594330017362505588078.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
09536750017362505589486.jpg
Pyrite

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
01187580017361079348905.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
03845180017418442453232.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
08087990017272019319411.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
00918400017272019335303.jpg
Pyrite

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
01187580017361079348905.jpg
Pyrite, etc.

Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
Locality type:Road Cutting
Classification
Species:Pyrite
Formula:FeS2
Formation:Primary
Comments:Crystals generally very small <2mm, but typically well formed and complex, associated with barite, galena, quartz, sphalerite, stilbite, heulandite. Twinned crystals are very common. Some repeated twins have been found >1 cm. Pyrite aggregates may mimic marcasite crystal groups with rather typical curved faces. Under the microscope they appear as aggregates of small cubes.
Habit:cubic, pyritohedral, octahedral, unusual elongated forms. Penetration twins.
Colour:brass-yellow, sometimes iridescent or with a reddish-brown coating.
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Quartz38
Heulandite-Ca21
Calcite18
Fluorite15
Harmotome14
Sphalerite9
Galena7
Stilbite Subgroup6
Baryte3
Albite3
Anatase2
Heulandite Subgroup1
Data
Mineral Data:Click here to view Pyrite data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
Photo GalleryView Gallery (12 photos)
Data Identifiers
Mindat Occurrence Record ID:96376
Long-form Identifier:1:3:96376:3
GUID (UUID V4):0
Nearest other occurrences of Pyrite
1.6km (1.0 miles) ⓘState Routes 8 and 222 interchange, Thomaston, Litchfield County, Connecticut, USA
5.0km (3.1 miles) ⓘReynolds Bridge, Thomaston, Litchfield County, Connecticut, USA
5.9km (3.7 miles) ⓘWaterbury Road quarry, Thomaston, Litchfield County, Connecticut, USA
7.7km (4.8 miles) ⓘState Routes 8 and 118 interchange, Harwinton, Litchfield County, Connecticut, USA
10.3km (6.4 miles) ⓘSouth Main Street construction site, Torrington, Litchfield County, Connecticut, USA
10.7km (6.7 miles) ⓘState Route 8 interchange 34 (formerly 37), Watertown, Litchfield County, Connecticut, USA
11.2km (7.0 miles) ⓘBlue Stone Quarry, Waterbury, New Haven County, Connecticut, USA
12.2km (7.6 miles) ⓘBristol Copper Mine, Bristol, Hartford County, Connecticut, USA
12.8km (8.0 miles) ⓘRoute 73 quarry, Waterbury, New Haven County, Connecticut, USA
15.1km (9.4 miles) ⓘMountain Top Trucking quarry, Torrington, Litchfield County, Connecticut, USA
References
Rocks & Minerals: 34: 3.
Zodac, Peter (1959) Minerals at Thomaston Dam, Conn. Rocks & Minerals, 34 (1) 3-48 doi:10.1080/00357529.1959.11766706
Segeler, Curt G., Molon, Joseph (1985) The Thomaston Dam Site Thomaston, Connecticut. Rocks & Minerals, 60 (3) 119-124 doi:10.1080/00357529.1985.11764386
Vogt, Wolfgang. (1991), Rediscovering Thomaston Dam. Lapidary Journal: April.
 
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