metamorphic

Quartz-mica schist (likely garnet-bearing)

Schist dominated by quartz and mica; possible biotite/muscovite and garnet

AI-generated identification · may be incorrect

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.

Identified September 21, 2026More metamorphic →

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Physical properties

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.