Code:ML300
| 名稱 十字石 | Name Staurolite |
| 化學公式 Fe2+2Al9O6(SiO4)4(O,OH)2 | Chemical Formula Fe2+2Al9O6(SiO4)4(O,OH)2 |
| 莫氏硬度 7-7.5 | Mohs scale of Hardness 7-7.5 |
| 描述 十字石是島狀結構硅酸鹽礦物，它因有一個奇特的十字外形而得名。十字石又硬又脆，具有暗淡的光澤，一般為暗褐色。罕見的透明十字石可當作寶石。因為它的形狀，人們常用它製成裝飾品。 | Description Staurolite is a reddish brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and the chemical formula: Fe2+2Al9O6(SiO4)4(O,OH)2. Magnesium, zinc and manganese substitute in the iron site and trivalent iron can substitute for aluminium. |
| 小挑戰 你知道嗎？ 十字石因形成短稜柱狀晶體，且通常會形成十字型的雙晶故得名，透明的十字石很稀有，一般來說不透明且十字型的十字石經常被用作護身符以及西方的宗教珠寶 | Challenge Do you know? Because of it’s Short prismatic crystals , and cross-shaped double crystals ,hence the name. Transparent staurolites are rare. Generally speaking, opaque and cross-shaped staurolites are often used as amulets and Western religious jewelry. |
Reference
https://www.stonexp.idv.tw/i.h?cls=100&id=62&pg=1,0