Constituent
- Name
- Bassanite
- IMA name
- Bassanite
- Class
- non-silicate mineral
- Compound type
- sulfate
- Relevance
- main - minor
- Arrangement
- in multi-phases
- Mass fraction
- 0.03 $\pm$ 0.1
- Formula
- $Ca_2(SO_4)_2 \bullet (H_2O)$
- Chemical formula
- Ca2(SO4)2•(H2O)
- Elemental formula
- (Ca2+)2 S2 O5 (O-)4 H2
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $CaO$ $H_{2}O$ $SO_{3}$ Mass fraction (%) 38.63 6.21 55.16
Strunz
- Class
- sulfates - chromates - molybdates - tungstates (07)
- Division
- sulfates (selenates, etc.) without additional anions, with H2O (07.C)
- Family
- with only large cations (07.CD)
- Code
- 07.CD.45
Dana
- Major class
- sulfates, chromates, selenates (VI)
- Class
- hydrated acid and sulfates (29)
- Type
- where AXO4.x(H2O) (29.06)
- Group
- -Bassanite- group (29.06.01)
- Code
- 29.06.01.01
- Phase type
- crystalline
- Crystal system
- monoclinic
- Crystal class
- sphenoidal
- Crystal class symbol
- 2 (C2)
- Crystal spacegroup
- C2
- Molar mass
- 290.30 $g/mol$
- Density
- 2.7 $g/cm^3$
- Refringence type
- uniaxial
- Refringence sign
- positive
- Birefringence
- 0.020
- Refraction index $n_{\alpha}$
- 1.55
- Refraction index $n_{\beta}$
- 1.57
- Color
- colorless, snow white
- Diaphaneity
- transparent to translucent
- Luster
- earthy