Gypsum: Difference between revisions
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|MolVolume = 74,69 cm<sup>3</sup>/mol | |MolVolume = 74,69 cm<sup>3</sup>/mol | ||
|Molweight = 172,17g /mol | |Molweight = 172,17g /mol | ||
|Transparency = | |Transparency = transparent to opaque | ||
|Cleavage = | |Cleavage = perfect | ||
|Crystal_Habit = | |Crystal_Habit = | ||
|Twinning = | |Twinning = | ||
Revision as of 12:16, 9 June 2011
| Gypsum[1][2] | |
| |
| Mineralogical name | Gypsum, Selenite |
| Chemical name | Calcium sulphate dihydrate |
| Trivial name | Gypsite, Sulphate of Lime |
| Chemical formula | Ca[SO4]•2H2O |
| Other forms | Anhydrite (CaSO4) Hemihydrate (CaSO4•0,5H2O) |
| Crystal system | {{{Crystal_System}}} |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | 2,2-2,4 g/cm³ |
| Molar volume | 74,69 cm3/mol |
| Molar weight | 172,17g /mol |
| Transparency | transparent to opaque |
| Cleavage | perfect |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | |
| Crystal Optics | |
| Refractive Indices | α = 1,519-1,521 β = 1,522-1,523 γ = 1,529-1,530 |
| Birefringence | Δ = 0,010 |
| Optical Orientation | biaxial positive |
| Pleochroism | |
| Dispersion | 58° |
| Used Literature | |
| {{{Literature}}} | |
back to Sulphate
Weblinks[edit]
- ↑ http://webmineral.com/data/Gypsum.shtml seen on 30.07.2010
- ↑ http://www.mindat.org/min-1784.html seen on 30.07.2010