Kieserite
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| Kieserite | |
|---|---|
.jpg) Kieserite | |
| General | |
| Category | Sulfate minerals |
| Formula (repeating unit) | MgSO4·H2O |
| Strunz classification | 07.CB.05 |
| Dana classification | 29.6.2.1 |
| Crystal symmetry | 2/m |
| Identification | |
| Color | Colorless, grayish-white or yellowish |
| Crystal habit | Massive, granular |
| Crystal system | Monoclinic |
| Cleavage | {110} and {111} perfect |
| Fracture | Uneven |
| Tenacity | Fragile |
| Mohs scale hardness | 3.5 |
| Luster | Vitreous to dull |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.57 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.520 nβ = 1.533 nγ = 1.584 |
| References | [1][2] |
Kieserite is a highly unstable magnesium sulfate mineral (MgSO4·H2O). It has a vitreous luster and it is colorless, grayish-white or yellowish. Its hardness is 3.5 and it has a monoclinic crystal system. It is used in the production of Epsom salt and is named after Dietrich Georg von Kieser (Jena, Germany 1862).
In early 2005, Mars Express, a European Space Agency orbiter, discovered evidence of kieserite in patches of Valles Marineris (the largest canyon on Mars), along with gypsum and polyhydrated sulfates. This is direct evidence of Mars's watery past and augments similar discoveries made by the Mars Exploration Rover Opportunity in 2004.
Related minerals
- Gunningite is the Zn-rich version of this mineral
- Epsomite is more hydrated version
See also
References
- ↑ http://webmineral.com/data/Kieserite.shtml Webmineral data
- ↑ http://www.mindat.org/min-2204.html Mindat
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