mineral
Likely rough garnet crystals
Possibly almandine garnet, Fe₃Al₂(SiO₄)₃; identification is uncertain from the photograph
AI-generated identification · may be incorrectDark reddish-brown to nearly black, rough, vitreous to dull surfaces; garnet has Mohs hardness 6.5–7.5, cubic crystal structure, no cleavage, and specific gravity around 3.5–4.3. The image does not show diagnostic crystal faces or a fresh surface.
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Physical properties
Dark reddish-brown to nearly black, rough, vitreous to dull surfaces; garnet has Mohs hardness 6.5–7.5, cubic crystal structure, no cleavage, and specific gravity around 3.5–4.3. The image does not show diagnostic crystal faces or a fresh surface.
Formation & geological history
If garnet, it formed during metamorphism or in igneous rocks and associated deposits; garnets occur in rocks of many geological ages.
Uses & applications
Garnets are used as gemstones and, when lower grade, as abrasives and waterjet-cutting media.
Geological facts
Garnet is a mineral group, not a single species; its members vary in composition and color.
Field identification & locations
Compare color and crystal shape, and test hardness on an inconspicuous spot; visual identification alone is unreliable. Garnets occur worldwide, including India, Sri Lanka, Madagascar, and the United States.
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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