Gypsum

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Gypsum
Mineralogical name	Gypsum
Chemical name	Calcium sulfate dihydrate
Trivial name	plaster of paris, Alabaster, Satin Spar, Selenite
Chemical formula	Ca[SO4]•2H2O
Other forms	Anhydrite (CaSO4) Hemihydrate (CaSO4•0.5H2O)
Crystal system	monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C	2.14 g/l
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, clearly visible formation of fibre
Crystal habit	flat, prismatic, needle- like crystal, granular, massive aggregate
Twinning	very common
Phase transition
Chemical behavior	hardly soluble in water
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	colorless
Dispersion	58°
Used Literature
{{{Literature}}}

Authors: Hans-Jürgen Schwarz , Nils Mainusch, Tim Müller
English Translation by Sandra Leithäuser
back to Sulfate

A phase is a physically distinctive form of matter and is characterized by having relatively uniform chemical and physical properties.