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Colemanite with Realgar

#FD14593

Colemanite with Realgar

#FD14593
Availability
Sold
Size
5 x 6 x 5 cm - Sm Cabinet 
Formula
CaB3O4(OH)3·H2O (RRUFF)
Locality
Boron, Kern Co., California, United States
Tagged
sulfide , Boron

This was a rather uncommon find many years back from Fred DeVito's days. Of course the mine goes back to the old west days and made famous by the "20 Mule Team" at Borax. Colemanite of course is the ore, but the Realgar gives it a nice touch with acicular crystals to 3mm in the pocket.

Colemanite

Formula
CaB3O4(OH)3·H2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Crystalline - Coarse, Massive - Granular 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, gray white, yellowish white, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
DeVito Collection

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