A stunning cluster of unusually shaped Barite Crystals. There is almost no matrix on this piece, just pure, well terminated crystals which make it an ideal addition to a collection. Also known as Baryte, it is named after the Greek word for ‘weight’ which is considerable for a non-metallic material. A very nice specimen with chisel shaped terminations. Our photos don’t do this specimen justice.
10cm x 7cm x 2.4cm, 235g.
Yao Gan Xian, Guangxi, China.
Magnetism:Diamagnetic. Thermal Behaviour: Inverts to another (monoclinic ?) polymorph when heated to 1149°C. Above 1400°C decomposition to barium oxide, sulphur dioxide and oxygen. Thermoluminescent at times. Insoluble in water, acids and bases. Moderately soluble in hot, concentrated sulphuric acid, due to formation of the hydrogen sulphate. Fascinating material properties.