mineral
Raw reddish-brown mineral specimen, possibly garnet
Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂); identification is uncertain from the blurred image
AI-generated identification · may be incorrectDark red to brown, vitreous to resinous luster, likely translucent; garnet has Mohs hardness 6.5–7.5, cubic crystals, no cleavage, and specific gravity about 3.5–4.3. The specimen appears irregular and partly crystalline.
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Physical properties
Dark red to brown, vitreous to resinous luster, likely translucent; garnet has Mohs hardness 6.5–7.5, cubic crystals, no cleavage, and specific gravity about 3.5–4.3. The specimen appears irregular and partly crystalline.
Formation & geological history
Garnet commonly forms in regionally or contact-metamorphosed schist, gneiss, and skarn, with many deposits dating from ancient Precambrian to younger mountain-building events. It may also occur as weathered placer grains.
Uses & applications
Gem-quality garnet is used in jewelry; industrial garnet is used as an abrasive, blasting media, and waterjet-cutting material. Ordinary rough pieces have mainly educational or collecting value.
Geological facts
Almandine is the most common red garnet and often shows deep wine-red coloration. Garnet is especially useful as a metamorphic index mineral because its composition records pressure and temperature conditions.
Field identification & locations
Look for a glassy, dense, non-cleavable grain that can scratch glass; a crystal habit with dodecahedral or trapezohedral faces supports garnet identification. Common sources include India, Sri Lanka, Madagascar, the United States, and Brazil.
