mineral
Likely rough garnet (possibly almandine)
Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃
AI-generated identification · may be incorrectOpaque, reddish-brown, rough granular specimen with a dull to slightly vitreous luster. Garnets typically have Mohs hardness 6.5–7.5, cubic crystal structure, no cleavage, and specific gravity around 3.5–4.3; the photo alone cannot confirm the species.
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Physical properties
Opaque, reddish-brown, rough granular specimen with a dull to slightly vitreous luster. Garnets typically have Mohs hardness 6.5–7.5, cubic crystal structure, no cleavage, and specific gravity around 3.5–4.3; the photo alone cannot confirm the species.
Formation & geological history
Garnet commonly forms during metamorphism of aluminum-rich rocks, especially schist and gneiss; it can also occur in igneous rocks and sediments. Its age depends on the host rock and locality.
Uses & applications
Transparent material is cut for jewelry; lower-grade garnet is used as an abrasive in sandpaper, waterjet cutting, and filtration.
Geological facts
Garnet is a mineral group rather than a single mineral, and its colors include red, orange, green, and purple.
Field identification & locations
Check for a glassy surface, high hardness, and absence of cleavage; garnet crystals are often dodecahedral, though this specimen appears weathered or broken. Garnet occurs 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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous