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Colemanite on Calcite

#PD33330

Colemanite on Calcite

#PD33330
Availability
Sold
Size
2 x 7 x 6 cm - Sm Cabinet 
Formula
CaB3O4(OH)3·H2O (RRUFF)
Locality
Boron, Kern Co., California, United States
Tagged
borate

Thin fin-like crystals of Colemanite to 1cm on lustrous translucent honey-colored botryoidal Calcite.  Sample looks wet due to the smooth surface of the Calcite. 

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
Phillips Collection

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