Colemanite (R6201)

Colemanite is a type of mineral found in lake-like areas. It has a monoclinic crystal structure.
It can be colorless or white.
It has a glassy luster.
It occurs together with borax in playa and salt lakes in arid climatic regions.
Crystal System, Monoclinic
Crystal Form, Mostly equidimensional and short prismatic crystal; massive, compact, granular
Hardness, 4.5
Specific Gravity, 2.42
my cleavage, {010}
Color and Transparency, Colorless, white; transparent-semi-transparent
Luster, Glassy
Distinctive Features, Crystal form, perfect cleavage, being harder than other borates
Its occurrence occurs together with borax in playa and salt lakes in arid climate zones.