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0 item @ $0.00  

Dolomite with Pyrite

#37711

Dolomite with Pyrite

#37711
Availability
Sold
Size
8 x 4 x 2.5 cm - Sm Cabinet 
Formula
CaMg(CO3)2 (RRUFF)
Locality
Homestake mine, Lawrence Co., South Dakota, United States
Tagged
carbonate

White Dolomite in rhombs and casts with colorless Adularia, Pyrite and Quartz. This is a good typical specimen from Homestake's "water course" mineralization, which occured deep underground as extremely hot water conduits. Often times, these dikes were filled with spectacular crystals of quartz, adularia, pyrite, sphalerite etc. I often thought these deposits were actually alpine type mineralization, just underground however but still in mountainous terrain.

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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