mineral
Rough red garnet crystal
Likely almandine garnet, Fe₃Al₂(SiO₄)₃; species cannot be confirmed from the image alone
AI-generated identification · may be incorrectDeep red, vitreous to resinous luster, with a roughly equant crystal form; garnets have cubic crystal symmetry and no cleavage. Hardness is typically 6.5–7.5 Mohs and specific gravity about 3.5–4.3.
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Physical properties
Deep red, vitreous to resinous luster, with a roughly equant crystal form; garnets have cubic crystal symmetry and no cleavage. Hardness is typically 6.5–7.5 Mohs and specific gravity about 3.5–4.3.
Formation & geological history
Garnets commonly crystallize during metamorphism of aluminum-rich rocks, or form in igneous rocks and related deposits. Their ages vary widely with the host rock and can span much of Earth’s geological history.
Uses & applications
Gem-quality material is cut for jewelry; less transparent garnet is used as abrasive in blasting, waterjet cutting, and sandpaper.
Geological facts
Garnet is a mineral group, not a single mineral; its members share a silicate structure but differ in composition.
Field identification & locations
The image shows a red, rough crystal consistent with garnet, but species identification requires tests such as composition or optical properties. Garnets occur worldwide, including India, Sri Lanka, Madagascar, and the United States.
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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