Selenite
Varietyof Gypsum
Selenite is transparent crystalline gypsum. As a variety of Gypsum, it shares that species' composition (Ca(SO4)·2H2O), crystal structure, and hardness; the distinction is the appearance defined above.
Photos
About Gypsum
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Gypsum species page.
| Formula | Ca(SO4)·2H2O |
|---|---|
| Hardness (Mohs) | 2 |
| Density (calculated) | 2.31 |
| Crystal system | monoclinic |
| Streak | white |