Topic Archives: Selenite


  Crystal Bible        

Gypsum is a hydrous calcium sulphate, when well crystallised producing excellent transparent monoclinic crystals, which are often twinned in swallow-tail forms. Such crystals of gypsum are called selenite, for the crystals tend to show moon-like iridescence from the cleavage surfaces.

It is usually formed by the evaporation of an enclosed sea basin, or may […]

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