Barite (Baryte)
Barite is a fairly common mineral that may superficially resemble calcite. It is usually found as a colourless mass but may form prismatic or tubular crystals or may be found to form granular aggregates. Barite is found in South Africa, Namibia, Zimbabwe, Botswana, and Swaziland.
Chemical Formular : BaSO4
Refractive Index : 1.63
Hardness : 3 on the Mohs Scale
Crystal System : Orthorhombic