STIBICONITE, SULPHUR, KERMESITE (long crystal 310 mm). Xikuangshan Sb deposit Lengshuijiang Co. Loudi Hunan PRC

Stibiconite, previously referred to as stiblite or antimony ochre, is a mineral made up of antimony oxide with the chemical formula Sb3O6(OH). The name comes from the Greek words for antimony and powder, reflecting its makeup and form. This mineral belongs to the pyrochlore supergroup. 

It was first identified in 1862 in the Brandholz – Goldkronach District of the Fichtel Mountains in Bavaria, Germany. Stibiconite typically forms as a secondary product from the alteration of other hydrothermal antimony minerals, particularly stibnite. It is often found alongside minerals like cervantite, valentinite, kermesite, native antimony, and stibnite.

Kermesite, also known as antimony oxysulfide, red antimony, or purpur blende, is a mineral with the chemical formula Sb2S2O. Its color can vary from cherry red to dark red and even black. This mineral forms through the partial oxidation of stibnite (Sb2S3) and other antimony oxides like valentinite (Sb2O3) or stibiconite (Sb3O6(OH)). Kermesite appears when the process of converting all sulfur to oxygen is interrupted, particularly in the presence of oxygenated fluids.