mineral
Likely raw garnet crystal
Garnet-group silicate, probably almandine (Fe₃Al₂Si₃O₁₂)
AI-generated identification · may be incorrectDark reddish-brown, vitreous to resinous luster, irregular fractured surfaces, and possible partial crystal faces; garnet hardness is 6.5–7.5 Mohs, with no cleavage and commonly dodecahedral or trapezohedral crystals. The photograph alone cannot confirm species; iron-rich garnet is suggested by the color.
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Physical properties
Dark reddish-brown, vitreous to resinous luster, irregular fractured surfaces, and possible partial crystal faces; garnet hardness is 6.5–7.5 Mohs, with no cleavage and commonly dodecahedral or trapezohedral crystals. The photograph alone cannot confirm species; iron-rich garnet is suggested by the color.
Formation & geological history
Garnets form chiefly in medium- to high-grade metamorphic rocks such as schist and gneiss, and also in some igneous rocks and placer deposits. Individual crystals may be hundreds of millions to billions of years old, depending on their host rock.
Uses & applications
Gem-quality garnet is used in jewelry; nongem material is used as abrasive in sandpaper, waterjet cutting, and filtration media. This small, fractured specimen is mainly of collector interest.
Geological facts
Garnet is a mineral group rather than one single mineral, with compositions ranging from iron-, magnesium-, calcium-, and manganese-rich varieties. It commonly survives weathering and concentrates in stream sands.
Field identification & locations
Look for a dense, glassy reddish crystal without cleavage, often with dodecahedral faces; a streak test, hardness test, and specific-gravity measurement would help distinguish it from glass, slag, or jasper. Common sources include India, Sri Lanka, Madagascar, the United States, and Brazil.
