metamorphic
Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist
Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix
AI-generated identification · may be incorrectDark green-gray, coarse and strongly granular, with a prominent brown-orange garnet crystal; likely hardness 6–7 overall, garnet about 6.5–7.5 Mohs, vitreous to dull luster, and no obvious cleavage in the garnet.
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Physical properties
Dark green-gray, coarse and strongly granular, with a prominent brown-orange garnet crystal; likely hardness 6–7 overall, garnet about 6.5–7.5 Mohs, vitreous to dull luster, and no obvious cleavage in the garnet.
Formation & geological history
Formed when a mafic igneous protolith was subjected to elevated temperature and pressure during regional metamorphism, commonly in Precambrian to Paleozoic mountain belts; exact age cannot be determined visually.
Uses & applications
Primarily a collector specimen; garnet may be used as an abrasive or gemstone, while the host rock has little commercial value for construction unless quarried locally.
Geological facts
The orange-brown crystal is consistent with almandine or an almandine-rich garnet, but identification requires testing or analysis; green matrix minerals may include amphibole, chlorite, epidote, and feldspar.
Field identification & locations
Look for a dense dark metamorphic matrix containing embedded, glassy garnet grains; garnet is commonly found in metamorphic terrains worldwide, including India, Madagascar, Norway, the United States, and Canada.
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