metamorphic
Garnet-bearing mica schist
Mica schist with garnet porphyroblast, likely almandine (Fe₃Al₂(SiO₄)₃)
AI-generated identification · may be incorrectVisible reddish garnet crystals occur in a coarse, foliated matrix of mica and quartz; garnet hardness is about 6.5–7.5 Mohs, with vitreous luster and cubic crystal structure. The mica-rich host is typically softer, around 2–3 Mohs, and may show shiny, platy cleavage.
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Physical properties
Visible reddish garnet crystals occur in a coarse, foliated matrix of mica and quartz; garnet hardness is about 6.5–7.5 Mohs, with vitreous luster and cubic crystal structure. The mica-rich host is typically softer, around 2–3 Mohs, and may show shiny, platy cleavage.
Formation & geological history
Formed when clay-rich sedimentary rocks were buried and metamorphosed under heat and pressure, growing garnet crystals within schist. Such rocks form across many geological ages and commonly occur in regional metamorphic belts.
Uses & applications
Used as a decorative or educational specimen; garnet may be recovered for abrasives or, when clear and well-formed, gemstones. Schist is also occasionally used as building or landscaping stone.
Geological facts
Garnets commonly grow as porphyroblasts—large crystals embedded in a finer metamorphic fabric—and can indicate the pressure-temperature history of their host rock.
Field identification & locations
Identify it by the red, hard garnet crystals and the visibly layered, mica-rich matrix. Garnet schist occurs in metamorphic regions worldwide; the pictured specimen’s exact locality cannot be determined from the image.
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