Gypsum

Gypsum
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}}}

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