Mineral phase
- IMA name
- Kieserite
- IMA Code
- Ksr
- Class
- non-silicate mineral
- Compound type
- sulfate
- Formula
- MgSO4∙H2O
- Chemical formula
- MgSO4•H2O
- Elemental formula
- (Mg2+) S O3 (O-)2 H2
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula MgO SO_{3} H_{2}O Mass fraction (%) 29.13 57.86 13.02
Strunz
- Class
- sulfates - chromates - molybdates - tungstates (07)
- Division
- sulfates (selenates, etc.) without additional anions, with H2O (07.C)
- Family
- with only medium-sized cations (07.CB)
- Code
- 07.CB.05
Dana
- Major class
- sulfates, chromates, selenates (VI)
- Class
- hydrated acid and sulfates (29)
- Type
- where AXO4.x(H2O) (29.06)
- Group
- Kieserite group (Monohydrates) (29.06.02)
- Code
- 29.06.02.01
- Phase type
- crystalline
- Crystal system
- monoclinic
- Crystal class
- prismatic
- Crystal class symbol
- 2/m (C2h)
- Crystal spacegroup
- C2/c
- Molar mass
- 138.38 g/mol
- Density
- 2.57 g/cm^3
- State NTP
- solid
- Phase transitions
-
Phase transition type Other phases Temperature - Pressure solid-solid Hexahydrite below 68°C (341 K) solid-solid Hexahydrite above 42% RH
- Refringence type
- biaxial
- Refringence sign
- positive
- Birefringence
- 0.064
- Refraction index n_{\alpha}
- 1.52
- Refraction index n_{\beta}
- 1.533
- Refraction index n_{\gamma}
- 1.584
- Dispersion V
- relatively strong
- Pure color
- colorless
- Color
- colorless, white, gray white, yellowish, green yellow
- Diaphaneity
- transparent to translucent
- Luster
- vitreous