mineral
Selenite
Gypsum (CaSO4·2H2O)
AI-generated identification · may be incorrectMohs hardness of 2, white to translucent color, pearly to vitreous luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 2.3.
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Physical properties
Mohs hardness of 2, white to translucent color, pearly to vitreous luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 2.3.
Formation & geological history
Formed through the evaporation of sulfate-rich saline waters in sedimentary environments, often in playas, sabkhas, or ancient sea basins.
Uses & applications
Widely used for decorative carvings, towers, crystal healing, and in the production of drywall, plaster, and cement.
Geological facts
Selenite is named after the Greek goddess of the moon due to its soft, glowing pearlescent sheen. It is one of the softest minerals and can be easily scratched with a fingernail.
Field identification & locations
Easily identified by its extreme softness and lack of fizz when tested with acid. Commonly sourced from Mexico, Morocco, and the USA.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous