辉锑矿（Stibnite）
产地：湖南冷水江
特征：
辉锑矿是锑的硫化物（Sb2S3）矿物。含锑71.69%，是锑的最重要的矿石矿物。属正交（斜方）晶系。晶体常见，呈尖顶的长柱状，柱面具纵条纹。板面解理完全；解理面现平行横纹。集合体呈块状、粒状或放射状。铅灰色，金属光泽，莫氏硬度2，比重4.6。性脆，易熔。主要产于中、低温热液矿床，常与辰砂、雄黄、雌黄共生。湖南、贵州、广西、广东、云南等省都有辉锑矿床分布。湖南冷水江锡矿山的大型辉锑矿床闻名于世。
铅灰色，柱状晶形，解理面上有横纹，易溶，对于细粒的块体，滴KOH于其上，立刻呈现黄色，随后变成橘红色，以此区别与其类似的氧化物；辉锑矿，可以从晶形，条纹，完全解理，颜色和条痕当中，鉴定出来；它和方铅矿有时看来颇为类似，但是比方铅矿轻，晶形亦不相同。辉锑矿是提炼锑的最重要的矿物原料，最大用途是制造颜料锑白以及国防上用的特种合金，锑制剂曾用于治疗血吸虫病。辉锑矿常与黄铁矿、雌黄、雄黄、辰砂、方解石、石英等共生于低温热液矿床，是分布最广的锑矿石。中国是著名的产锑国家，储量居世界第一，尤以湖南新化锡矿山的锑矿储量大质量高。
Stibnite
Provenance: Lengshuijiang, Hunan, China
Characteristics:
Stibnite, sometimes called antimonite, is a sulfide mineral with the formula Sb2S3. This soft grey material crystallizes in an orthorhombic space group. It is the most important source for the metalloid antimony. The name is from the Greek στίβι stibi through the Latin stibium as the old name for the mineral and the element antimony.
Stibnite has a structure similar to that of arsenic trisulfide, As2S3. The Sb(III) centers, which are pyramidal and three-coordinate, are linked via bent two-coordinate sulfide ions. However, recent studies confirm that the actual coordination polyhedra of antimony are in fact SbS7, with (3+4) coordination at the M1 site and (5+2) at the M2 site. Some of the secondary bonds impart cohesion and are connected with packing. Stibnite is grey when fresh, but can turn superficially black due to oxidation in air. Pastes of Sb2S3 powder in fat or in other materials have been used since ca. 3000 BC as eye cosmetics in the Middle East and farther afield; in this use, Sb2S3 is called kohl. It was used to darken the brows and lashes, or to draw a line around the perimeter of the eye.