Prepn by direct fusion of B2O3 with CaCO3: Griveau, Compt. Rend.166, 993 (1918). Various calcium
borate minerals occur in nature. These include: colemanite, ginorite, inyoite, meyerhofferite, pandermite, priceite.
Derivative
Hexahydrate.
Properties
Powder. Almost insol in cold, moderately sol
in hot water; sol in dil acids.
Use
As flux in heavy-metal metallurgy; mfr of forsterite
porcelain insulators; in glycol antifreeze; in fire-retardant paint.