卤砂，英文名Salammoniac[2]，也称为 Sal ammoniac 或 Salmiac，是一种罕见的天然矿物，主要成分是氯化铵(NH4Cl)，可形成无色、白色或黄棕色等轴六面体点阵，难发生解理，易发生贝壳状破裂。
| 卤砂 | |
|---|---|
 Salammoniac crystals from a mine in Eisden, Maasmechelen, Limburg, Belgium (field of vision: 1.5 cm) | |
| 基本资料 | |
| 类别 | Halide mineral |
| 化学式 | NH4Cl |
| IMA记号 | Sam[1] |
| 施特龙茨分类 | 3.AA.25 |
| 晶体分类 | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| 晶体空间群 | Pm3m |
| 晶胞 | a = 3.859 Å; Z = 1 |
| 性质 | |
| 分子量 | 53.49 g/mol |
| 颜色 | Colorless, white, pale gray; may be pale yellow to brown, if impure. |
| 晶体惯态 | Crystals skeletal or dendritic; massive, encrustations |
| 晶系 | Isometric |
| 双晶 | On {111} |
| 解理 | Imperfect on {111} |
| 断口 | Conchoidal |
| 韧性/脆性 | Sectile |
| 莫氏硬度 | 1–2 |
| 光泽 | Vitreous |
| 条痕 | White |
| 透明性 | Transparent |
| 比重 | 1.535 |
| 光学性质 | Isotropic |
| 折射率 | n = 1.639 |
| 双折射 | Weak after deformation |
| 发光性 | No |
| 吸收光谱 | No |
| 溶解度 | In water |
参考文献
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