透石膏（英語：selenite），又稱透明石膏，是一種礦物，主要成分為二水合硫酸鈣（CaSO4·2H2O）。其英文名源於希臘語selēnitēs (lithos)，意思為「來自月亮的石頭」。[2]
| 透石膏 | |
|---|---|
 | |
| 基本資料 | |
| 類別 | 硫酸鹽礦物 |
| 化學式 | CaSO4·2H2O |
| 性質 | |
| 分子量 | 172.17 |
| 顏色 | 棕綠、棕黃、綠色、灰綠或灰白 |
| 晶體慣態 | Earthy – Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
| 晶系 | 單斜 (2/m) 空間群: 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). |
| 莫氏硬度 | 2 |
| 光澤 | Pearly |
| 條痕 | 白色 |
| 比重 | 2.9 |
| 光學性質 | 雙軸 (-) 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] |
參考文獻
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