Gypsum

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Revision as of 14:46, 3 June 2011 by SNitschel (talk | contribs) (moved Gipsum to Gypsum)

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Gypsum[1][2]
SA101 1.jpeg
Mineralogical name Gipsum, 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
Cleavage
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}}}


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