Boracite
Chemical Formula	Mg3B7O13Cl
Species	Borates
Crystal System	Orthorhombic
Mohs Scale	7
Specific Gravity	2.95
Color	Blue green, colorless, gray, yellow, orange, brown, white, blue, pale green, dark green; colorless in transmitted light
Streak	White
Luster	Adamantine, Vitreous
Refractive Index	n = 1.658 - 1.662 n = 1.662 - 1.667 n = 1.668 - 1.673
Diaphaneity	Transparent, Translucent
Cleavage	None Observed
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Crystalline, disseminated
Geological Setting：Bedded sedimentary deposits of gypsum and anhydrite; salt deposits; potash deposits of the oceanic type.