metamorphic

Quartz-bearing metamorphic rock, likely garnet-mica schist

Quartz–mica schist with probable garnet and iron-oxide minerals

AI-generated identification · may be incorrect

Visible white quartz veins occur in a dark, foliated matrix with reddish-brown mica or iron oxides and possible garnet; quartz hardness is 7, while mica is 2–3. Luster ranges vitreous on quartz to pearly/metallic on reflective mica; foliation and irregular veining are prominent.

Identified August 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when preexisting sedimentary or igneous rock was subjected to regional metamorphism, producing aligned mica and recrystallized quartz; the specimen may be Paleozoic or older, but age cannot be determined from the image. Quartz veins formed when hot, silica-rich fluids filled fractures during or after metamorphism.

Uses & applications

Primarily a collector specimen or field-geology sample; similar schists can be used as decorative stone, while quartz-rich material may be crushed for aggregate. It is generally unsuitable for high-grade jewelry unless attractive garnet or unusual metallic minerals are present.

Geological facts

The rusty red coloration commonly reflects oxidation of iron-bearing minerals such as biotite, garnet, or sulfides. A fresh broken surface should reveal interlocking grains and planar mica alignment rather than sedimentary layering.

Field identification & locations

Look for foliation, sparkly platy mica, hard glassy quartz veins, and a streak that is usually pale or colorless for quartz; a hand lens and hardness test help confirm it. Common in regional metamorphic belts worldwide, including the Appalachians, Alps, and Precambrian shields.