Note:  Do not rely on this information. It is very old.


Chromite, Chromic Iron, or Chrome Iron Obe, is an oxide of chromium, aluminium, iron and magnesium. It is hardly fusible alone, but with borax gives a chrome-green bead. It crystallises in regular octahedra, but is more commonly massive, sub-metallic, black, opaque, brittle, and sometimes magnetic. Hardness = 5.5. Specific gravity = 4.3 to 4.5. Chromite occurs chiefly in serpentinites and other rocks rich in magnesia, and is the principal source of the salts of chromium.