Barite

Introduction: Barite is widely distributed in Namibia and can be found in many different geological locations. A common mineral, it can resemble calcite to the untrained eye. The name is derived from the Greek barys meaning 'heavy', barium being a dense element. Chemical uses in the manufacturing industry include plastics and rubber, paper, paint, glass and ceramics. It is most widely used as an oil-drilling mud as its weight keeps gas and oil in the borehole when drilling is taking place.

Distribution: Rosh Pinah Mine in the Luderitz District, Gross Brukkaros, Okorusu Fluorite Mine, Omaue copper deposit in Kaokoland, Otjosondu manganese deposit, west of Tses in Namaland and on the farm Blydskap 268 in the Outjo District. On occasions the Tsumeb Mine produced chocolate-brown, tabular crystals up to 10cm long.

Composition: Sulphate

Crystal system: Orthorhombic

Lustre: Vitreous to resinous

Streak: White.

Hardness: 3-3.5