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Dolomite with Quartz

#61150
SOLD
Dolomite from Homestake mine, Lawrence Co., South Dakota, United States - 61150
Dolomite from Homestake mine, Lawrence Co., South Dakota, United States - 61150

Dolomite with Quartz

#61150
Availability
Sold
Size
12.5 x 10 x 3 cm - Cabinet 
Formula
CaMg(CO3)2 (RRUFF)
Locality
Homestake mine, Lawrence Co., South Dakota, United States
Tagged
carbonate

White rhombic, saddle-shaped habit Dolomite crystals to 7mm with needle Quartz. This is from an old collection. The Homestake mine, one of the greatest and largest in the world, is no longer in operation. Specimens such as this one are from "water course" Teritary mineralization.

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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