Colemanite
ID: 74
Colemanite
Chemical Formula
Ca₂B₆O₁₁·5H₂O
Hardness (Mohs)
4.5
Crystal System
Monoclinic
Streak
White
Luster
Vitreous (Glassy)
Diaphaneity
Transparent to translucent
Color
Colorless, Gray, Gray white, Yellowish white, White.
Density
2.42
Fun Facts
Also known as a hydrated calcium borate, Gerstley borate, or borocalcite. H-M Symbol: 2/m. Uses: Glass Industry, Ceramics, Fertilizers.