mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
Hardness: 2 (Mohs), Color: White or pearly, Luster: Silky or pearly, Crystal structure: Monoclinic, Cleavage: Perfect, Specific Gravity: 2.3
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Physical properties
Hardness: 2 (Mohs), Color: White or pearly, Luster: Silky or pearly, Crystal structure: Monoclinic, Cleavage: Perfect, Specific Gravity: 2.3
Formation & geological history
Forms as an evaporite mineral in sedimentary environments such as saline lakes, lagoons, and caves where calcium-rich water evaporates.
Uses & applications
Used in plaster of Paris, wallboard (drywall), soil fertilizer, and carved into decorative objects or palm stones for the metaphysical market.
Geological facts
Satin spar is often confused with 'true' selenite, which refers to the transparent variety. It exhibits a fiber-optic effect where light travels along its internal structure.
Field identification & locations
Identify by its extreme softness (can be scratched by a fingernail) and its distinctive fibrous, silky appearance. Commonly found in Morocco, USA, Mexico, and Brazil.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock