Mineral Species: Realgar
Chemical Formula: Arsenic Sulfide
Chemical Name: Arsenic Sulfide
Mineral Class: Sulfide
Mineral Notes: Realgar is a very unstable mineral and gradually changes to a yellow powder which is Orpiment on exposure to light. It differs from other orange and red minerals by having a uniquely orange-red streak which makes for easy identification. It typically occurs in ore veins with other Sulfides, particualrly Stibnite, and Silver and Gold. Often associated with hot-spring deposits.
Description: A complex matrix in which sit numerous cavities and indentations lined with yellow Orpiment and to a lesser extent red Realgar. The specimen is crowned by a single large crystal which is well formed and brightly coloured. There is marked transparency and some gemmyness. The contrast between the yellow and red is very attractive, greatly helped by the bright luster of both minerals.
Location: Junan, Wenshan, China.
