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礦物之美－（細硫砷鉛礦∼GRATONITE）
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GRATONITE Pb9As4S15 (trigonal) . steel-gray prismatic crystals . Cerro de Pasco, Pasco, Peru . 細硫砷鉛礦晶體呈柱狀，鋼灰色金屬光澤，硬度２鎅．在礦脈中與黝銅礦，硫 砷銅礦，雄黃為伍． 礦名來源：Louis Carly Graton (1880-1970), Professor of Economic Geology, Harvard University, Cambridge, Massachusetts, USA. |
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