Key facts
- Category
- Sulfate mineral
- Formula
- CaSO 4 ·2H 2 O
- Crystal system
- Monoclinic (2/m) Space group: A2/a
- Color
- Colorless, often tinted due to inclusions , Satin spar gypsum: white
- Crystal habit
- Platy , Satin spar gypsum: fibrous
- Cleavage
- Perfect, Distinct, Distinct
- Fracture
- Micaceous , Satin spar gypsum: fibrous
- Luster
- Vitreous , Satin spar gypsum: pearly
- Streak
- White
- Diaphaneity
- Transparent , Satin spar gypsum: translucent to opaque
- Optical properties
- Biaxial (+) 2V=58
- Refractive index
- nα = 1.519–1.521, nβ = 1.522–1.523, nγ = 1.529–1.53
- Birefringence
- δ = 0.0090–0.0100
- Other characteristics
- Fluorescent
via Wikipedia infobox
Wikidata facts
- Instance of
- mineral variety
- Subclass of
- gypsum
- Named after
- Selene
- Image
- Gypse Caresse.jpg
Show 6 more facts
- streak color
- white
- chemical formula
- CaSO₄·2H₂O
- Commons category
- Selenite
- Mohs' hardness
- 1.75
- density
- 2.320
- crystal system
- monoclinic crystal system
Sources (3)
via Wikidata · CC0