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Chromite

#45883
SOLD
Chromite from Stillwater mine, Nye Co., Montana, United States - 45883
Chromite from Stillwater mine, Nye Co., Montana, United States - 45883

Chromite

#45883
Availability
Sold
Size
11 x 7 x 6 cm - Cabinet 
Formula
Fe2+Cr2O4 (RRUFF)
Locality
Stillwater mine, Nye Co., Montana, United States

Rich, solid granular or crystalline aggregate of black Chromite ore. Though not producing Chromite ore, this large 30 mile complex of layer igneus mafic rock currently does not produce chromium ore. It is currently mined for its platinum and palladium only. Ore specimens are hard to obtain.

Widely used in chemicals, metals and refractory materials. Used to harden iron, nonferrous alloys and steel. The addition of 10% chromium also creates corrosion and oxidation resistant alloys such as stainless steel. According to the USGS Minerals Commodity Summary of 2106, about 95% of the world’s chromium resources is geographically concentrated in Kazakhstan and southern Africa; U.S. chromium resources are mostly in the Stillwater Complex in Montana although not currently producing chromium. 

1 lb 5oz

Chromite

Formula
Fe2+Cr2O4 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Granular, Nuggets 
Cleavage
None, None, None 
Luster
Metallic 
Color
black, brownish black 
Streak
brown 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
5.5 

Data courtesy of Webmineral.

Collection
Chris van Laer Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Chromite
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Other Available Chromite
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