mineral
Satin Spar Gypsum (Satin Spar Selenite)
Hydrous calcium sulfate (CaSO4%2H2O)
AI-generated identification · may be incorrectMohs hardness of 2 (can be scratched easily with a fingernail), silky to pearly luster, fibrous structure, perfect cleavage, white to translucent color, soft and lightweight.
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Physical properties
Mohs hardness of 2 (can be scratched easily with a fingernail), silky to pearly luster, fibrous structure, perfect cleavage, white to translucent color, soft and lightweight.
Formation & geological history
Forms as an evaporite mineral in lake and marine basins where saline waters evaporate, often found in association with halite and anhydrite.
Uses & applications
Widely used in ornamental carvings, crystal healing, metaphysical wands, charging plates, and industrially for plaster of Paris, drywall, and soil conditioning.
Geological facts
Though commonly sold as 'selenite' in the gem trade, this fibrous variety is technically 'satin spar'. It displays a chatoyant ('cat's-eye') effect along its fibrous axis.
Field identification & locations
Identified by its extreme softness (scratched by a fingernail) and distinct parallel fibrous structure. Major deposits are found in Morocco, Mexico, USA, and Madagascar.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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Septarian Pebble
Septarian nodule / Concretion
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