mineral
Likely raw garnet fragment
Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)
AI-generated identification · may be incorrectSmall dark reddish-brown, translucent-to-opaque fragment with vitreous to resinous luster and uneven fracture; garnet hardness is about Mohs 6.5–7.5, with no cleavage and commonly dodecahedral crystals. The image is low-resolution, so identification is provisional.
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Physical properties
Small dark reddish-brown, translucent-to-opaque fragment with vitreous to resinous luster and uneven fracture; garnet hardness is about Mohs 6.5–7.5, with no cleavage and commonly dodecahedral crystals. The image is low-resolution, so identification is provisional.
Formation & geological history
Garnet forms mainly in metamorphic rocks such as schist and gneiss, or in igneous and sedimentary deposits; many common almandine garnets formed during Paleozoic–Precambrian metamorphism. It is resistant to weathering and often accumulates in stream sediments.
Uses & applications
Used as an abrasive, filtration medium, and gemstone; attractive transparent crystals are faceted, while opaque fragments are mainly collector specimens or industrial abrasive material.
Geological facts
Garnet is a mineral group rather than one single mineral, and its color varies with composition. Unlike quartz, it lacks cleavage and commonly breaks with irregular, conchoidal-like fractures.
Field identification & locations
Look for a dense, glassy reddish grain without cleavage; a streak test, hardness test, and crystal form help distinguish it from glass or iron-rich slag. Common sources include India, Sri Lanka, Madagascar, the United States, and Scandinavia.
