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Rhodochrosite with pegmatite

#45843

Rhodochrosite with pegmatite

#45843
Availability
Sold
Size
6 x 5 x 1 cm - Sm Cabinet 
Formula
MnCO3 (RRUFF)
Locality
Butte dist., Silver Bow Co., Montana, United States
Tagged
carbonate

In prep for the upcoming Butte Special Edition, I was flipping through the 5 flats of material I have from Butte, all from Chris van Laers collection. I discovered this great petrological specimen which shows vein filling of pink Rhodochrosite in pegmatitic granite. The vein filling shows a little Quartz filling also and the granite is mineralized with sulfide, probably Pyrite. It is slightly polished on one side and unpolished on the other. It is a slab about 1cm thick.

Rhodochrosite

Formula
MnCO3 
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Columnar, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
pinkish red, red, rose red, yellowish gray, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness

Data courtesy of Webmineral.

Collection
Chris van Laer Collection

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