簡介:"礦物硫化物及硫鹽硫砷銅礦Enargite Sulfides and SulfosaltsConsisting of copper, arsenic and sulfur and small amounts of iron and zinc may be present. Enargite may contain some antimony in place of the arsenic. Enargite is usually found in prismatic crystals and are typically striated lengthwise.With a metallic luster, Enargite is notable for its grayish black color and streak. However, a tarnish will dull the luster of the crystals and the black color may turn into silver white over time if exposed to sun or air.An ore of copper, Enargite can also be a source of arsenic oxide. Enargite is found locally in the Chin-Kua-Shih gold and copper deposits in Taipei and is therefore an economically valuable mineral for it contains gold, silver and copper.主要由銅、砷、硫所構成,偶而含有少量的鐵和鋅,部分銻也會置換砷的位置。晶體多呈柱狀,並有條紋和長軸平行。 具金屬光澤,灰黑的顏色和條痕為其特徵。但若長期暴露地表或潮濕空氣中,常在表面發生氧化而轉為銀白色,並失去光澤。 硫砷銅礦可提煉銅,有時也可作為氧化砷的來源。台北金瓜石的金銅礦床中,也有硫砷銅礦產出,因含有金、銀和銅,具有經濟價值。"