Starkeyite
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| Starkeyite[1][2] | |
| Mineralogical name | Starkeyite, Leonhardtite |
| Chemical name | Magnesiumsulfate Tetrahydrate |
| Trivial name | |
| Chemical formula | MgSO4•4H2O |
| Other forms | Kieserite (MgSO4•H2O) Sanderite (MgSO4•2H2O) Pentahydrite (MgSO4•5H2O) Hexahydrite (MgSO4•6H2O) Epsomite (MgSO4•7H2O) Meridianiite (MgSO4•11H2O) Magnesium 12-Hydrate |
| Crystal system | monoclinic |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | 2.01 g/cm3 |
| Molar volume | 95.87 cm3/mol |
| Molar weight | 192.43 g/mol |
| Transparency | translucent to opaque |
| Cleavage | |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | unstable in air |
| Crystal Optics | |
| Refractive Indices | nx = 1.49 ny = 1.491 nz = 1.497 |
| Birefringence | Δ = 0.007 |
| Optical Orientation | positive |
| Pleochroism | |
| Dispersion | 22° |
| Used Literature | |
| [Lide:1995]Title: CRC Handbook of Chemistry and Physics Author: Lide D.R.  [Robson:1927]Title: The System MgSO4-H2O from 68 to 240°Author: Robson H.L.
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Weblinks[edit]
- ↑ http://webmineral.com/data/Starkeyite.shtml viewed on 29/07/2010
- ↑ http://www.mindat.org/min-3752.html viewed on 29/07/2010
Literature[edit]
| [Lide:1995] | Lide D.R. (eds.) Lide D.R. (1995): CRC Handbook of Chemistry and Physics, CRC Press | |
| [Robson:1927] | Robson H.L. (1927): The System MgSO4-H2O from 68 to 240°. In: J. Amer. Chem. Soc., 49 (11), 2772-2783 | |