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Dolomite with Calcite

#47891
SOLD
Dolomite from Homestake mine, Lawrence Co., South Dakota, United States - 47891
Dolomite from Homestake mine, Lawrence Co., South Dakota, United States - 47891

Dolomite with Calcite

#47891
Availability
Sold
Size
9 x 7 x 4.5 cm - Sm Cabinet 
Formula
CaMg(CO3)2 (RRUFF)
Locality
Homestake mine, Lawrence Co., South Dakota, United States
Tagged
carbonate

A "watercourse" specimen from the now closed Homestake gold mine. This specimen has colorless Dolomite rhombs to 8mm and Calcite crystals around 2-3mm with 2-3mm Pyrite crystals. Coverage on backside too.

Dolomite

Formula
CaMg(CO3)2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Massive, Blocky - Rhombohedral 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
white, gray, reddish white, brownish white, gray 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 

Data courtesy of Webmineral.

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