Pentahydrite
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| Pentahydrite[1][2] | |
| Mineralogical name | Pentahydrite, Allenite |
| Chemical name | Magnesiumsulfate Pentahydrite |
| Trivial name | |
| Chemical formula | MgSO4•5H2O |
| Other forms | Kieserite (MgSO4•H2O) Sanderite (MgSO4•2H2O) Starkeyite (MgSO4•4H2O) Hexahydrite (MgSO4•6H2O) Epsomite (MgSO4•7H2O) Meridianiite (MgSO4•11H2O) Magnesium 12-Hydrate |
| Crystal system | triclinic |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | 1.9 g/cm3 |
| Molar volume | |
| Molar weight | 210.3 g/mol |
| Transparency | |
| Cleavage | |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | unstable in air |
| Crystal Optics | |
| Refractive Indices | nx = 1.482 ny = 1.492 nz = 1.493 |
| Birefringence | Δ = 0.011 |
| Optical Orientation | negative |
| Pleochroism | |
| Dispersion | 45.1° |
| Used Literature | |
| [Dana:1951]Title: Dana's System of Mineralogy Author: Dana J.D. 
| |
Weblinks[edit]
- ↑ http://webmineral.com/data/Pentahydrite.shtml viewed on 29/07/2010
- ↑ http://www.mindat.org/min-3153.html viewed on 29/07/2010
Literature[edit]
| [Dana:1951] | Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & Sons | |