透石膏
透石膏(英语:selenite),又称透明石膏,是一种矿物,主要成分为二水合硫酸钙(CaSO4·2H2O)。其英文名源于希腊语selēnitēs (lithos),意思为“来自月亮的石头”。[2]
透石膏 | |
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基本資料 | |
類別 | 硫酸盐矿物 |
化學式 | CaSO4·2H2O |
性質 | |
分子量 | 172.17 u |
顏色 | 棕绿、棕黄、绿色、灰绿或灰白 |
晶体惯态 | Earthy – Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
晶系 | 单斜 (2/m) 空间群: A2/a |
解理 | [010] 完美, [100] 中等, [011] 中等 |
斷口 | Fibrous – Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos). |
摩氏硬度 | 2 |
光澤 | Pearly |
條痕 | 白色 |
比重 | 2.9 |
光學性質 | 双轴 (-) 2V=58 |
折射率 | nα=1.519-1.521, nβ=1.522-1.523, nγ=1.529-1.53 |
雙折射 | δ =0.0090-0.0100 |
其他特徵 | non-radioactive, non-magnetic, Fluorescent. |
參考文獻 | [1] |
参考文献
拓展链接
- Cavern of Crystal Giants Cueva de los Cristales, Peñoles Mine, Naica, Chihuahua, Mexico
- Mindat.org - scientific description of gypsum plus list of localities
- Mindat.org - satin spar localities
- 1927 article on the giant crystals of Naica
- Image of huge crystals of selenite
参见
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