Mineralpedia Details for Bentorite

Bentorite

Formula: Ca₆Cr₂(SO₄)₃(OH)₁₂·26H₂O
Crystal System: Hexagonal
Cleavage: Perfect, None, None
Luster: Vitreous (Glassy)
Color: violet, light violet
Streak: violet
Class: Hexagonal - Dihexagonal Dipyramidal
Hardness: 2
WebMineral: View Bentorite
Mindat: View Bentorite

Bentorite from Hatrurim Formation, Negev, Isreal

Special Info: Type Locality

Bentorite is a rare sulfate with chromium, which most likely is the cause of the lilac or purple color. It is found at only two localities worldwide. This is the type locality and is found in a low-temperture hydrothermal vein. The suite of minerals at this locality is similar to those at Crestmore.