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Gypsum
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CaSO4 - H2O (hydrous calcium sulphate)
Crystal system: Monoclinic
Refractive index: 1.519-1.531
Birefringence: 0.01
Cleavage: one perfect and one distinct
Twinning: common
Colour in PPL: colourless
Pleochroism: none
Relief: low
Distinction/Occurrence: is secondary mineral, crystalizing in voids during burial
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