White; symbol, BN; hexagonal rhombohedral, crystals or powder; the powder has a
Mohs hardness of 2; sublimes at about 3,000 degrees C; anisotropic; some
properties vary according to the method of preparation and the crystal form.
Used as a refractory; a high-temperature lubricant, as in glass molds; in
furnace insulation; and in molten-metal pump parts. CCD, 2; Handbook of
Chemistry and Physics, 2
Source: Dictionary of Mining, Mineral, and Related Terms
Dictionary of Mining, Mineral, and Related Terms