mineral
Likely garnet crystal (rough fragment)
Garnet group; possibly almandine, Fe₃Al₂(SiO₄)₃
AI-generated identification · may be incorrectDark reddish-brown, vitreous to resinous luster; garnets have Mohs hardness 6.5–7.5 and cubic crystals without cleavage. The small, partly obscured specimen cannot be identified confidently from appearance alone.
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Physical properties
Dark reddish-brown, vitreous to resinous luster; garnets have Mohs hardness 6.5–7.5 and cubic crystals without cleavage. The small, partly obscured specimen cannot be identified confidently from appearance alone.
Formation & geological history
Garnets commonly form during metamorphism of aluminum-rich rocks, though some occur in igneous rocks; their ages depend on the host deposit.
Uses & applications
Garnet is used as an abrasive and, when transparent and attractive, as a gemstone and jewelry material.
Geological facts
Garnet is a mineral group rather than a single mineral, with several species spanning a wide range of colors.
Field identification & locations
Look for a dense, hard crystal with a glassy surface and characteristic dodecahedral or rounded crystal faces; garnets occur worldwide in metamorphic terrains and stream gravels. A definitive identification may require testing or examination of the crystal form.
