Colemanite
Chemical Formula	CaB3O4(OH)3·H2O
Species	Borates
Crystal System	Monoclinic
Mohs Scale	4
Specific Gravity	2.42
Color	Colorless, white, yellowish, grey
Streak	White
Luster	Adamantine, Vitreous
Refractive Index	n = 1.586 n = 1.592 n = 1.614
Diaphaneity	Transparent, Translucent
Cleavage	PerfectOn perfect; on distinct.
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Massive granular to coarsely crystalline, most commonly nodular.
Geological Setting：Borate deposits formed in arid alkalai lacustrine environments.