1) Oxide mineral 
Kermesite or antimony oxysulfide is also known as red antimony (Sb2S2O) . The mineral’s color ranges from cherry red to a dark red to a black. Kermesite is the result of partial oxidation between stibnite (Sb2S3) and other antimony oxides such as valentinite (Sb2O3) or stibiconite (Sb3O6(OH)). Under certain conditions with oxygenated fluids the ...
a mineral, antimony oxysulfide, SbSO, occurring usually in tufts of red capillary crystals.