metamorphic
Quartz-mica schist (likely garnet-bearing)
Schist dominated by quartz and mica; possible biotite/muscovite and garnet
AI-generated identification · may be incorrectHardness about 2–7 depending on mineral; visibly foliated with glittery mica, pale quartz, and rusty iron staining. Uneven fracture, mica cleavage, and moderate density around 2.7–3.3 g/cm³; the dark reflective grain may be biotite or garnet.
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Physical properties
Hardness about 2–7 depending on mineral; visibly foliated with glittery mica, pale quartz, and rusty iron staining. Uneven fracture, mica cleavage, and moderate density around 2.7–3.3 g/cm³; the dark reflective grain may be biotite or garnet.
Formation & geological history
Formed when shale or a clay-rich sediment underwent medium-grade regional metamorphism, commonly during mountain building. Its exact geological age cannot be determined from the photograph.
Uses & applications
Used locally as decorative stone, landscaping material, and sometimes thin facing stone; attractive pieces are collected, though it is generally not a gemstone.
Geological facts
Schistosity results from aligned platy mica minerals, allowing the rock to split along glittery layers. The dark crystal could be garnet, but confirmation requires a close examination or testing.
Field identification & locations
Look for strong foliation, sparkly mica flakes, quartz-rich bands, and possible rounded garnet crystals; common in metamorphic mountain belts worldwide. Estimated value: $5–$25 for a common hand specimen, or $25–$75 if garnet-rich and well-presented.
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