a specific gravity of 2.9. Refractive index values are n? = 1.658 - 1.662, n? = 1.662 - 1.667 and n? = 1.668 - 1.673. It has a conchoidal fracture and does not show cleavage. It is insoluble in water (not to be confused with borax, which is soluble in water).

Boracite is typically found in evaporite sequences associated