Witherite

Name:
Witherite
Detailed information:

M Formula:	BaCO3
Properties:
White, yellowish, or grayish; vitreous, inclining to resinous, luster. D 4.27–4.35, Mohs hardness 3–3.75.
Occurrence:
U.S. (Kentucky, Lake Superior region), England (most important source).
Hazard:
Toxic by ingestion, skin irritant.
Use:
Chemicals (barium dioxide, barium hydroxide, blanc fixe), plate glass and porcelain, brick making, rodenticide.