stilbenite

Stilbenite is a rare mineral composed of antimony and sulfur. Its chemical formula is Sb2S2(S2) or Sb2S5. It is a member of the stibnite group of minerals. Stilbenite typically occurs as prismatic crystals, often found in association with other antimony-bearing minerals like stibnite and tetrahedrite. Its color is usually a dark lead-gray to black. It is relatively soft and has a metallic luster. The mineral is found in hydrothermal veins and is often associated with moderate to low-temperature ore deposits. Notable occurrences have been reported in various locations worldwide, including China, Japan, and the United States. Stilbenite is not economically significant as an ore of antimony, but it is of interest to mineral collectors and geologists due to its rarity and unique chemical composition. It is named after its principal element, antimony, derived from the Greek word 'antimony'.