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Calcite with Pyrite & Galena

#56421

Calcite with Pyrite & Galena

#56421
Availability
Sold
Size
10 x 8 x 5 cm - Cabinet 
Formula
CaCO3 (RRUFF)
Locality
Homestake mine, Lawrence Co., South Dakota, United States
Tagged
carbonate

This specimen is from an old miner's collection. Specifically it was collected from the 6850' main ledge at the Homestake. Specimens with this assembladge of minerals are termed "watercourse" minerals, which are Tertiary age open fracture systems sometimes with hot flowing water. It is a typical example with white Calcite rhombic crystals to 3mm, abundant 1mm cubic Pyrite crystals in 5mm clusters, tetrahedrons of black Sphalerite and dull octahedral crystals of pitted Galena. There my also be some Rutile. 

As you know, Homestake was the largest producing underground gold mines in the US for quite a while. These days it is the national underground lab seeking dark matter. 

Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness

Data courtesy of Webmineral.

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