metamorphic

Quartz-rich metamorphic rock, likely mica schist or quartzite

Quartz (SiO₂) with mica, feldspar, and possibly iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6–7 overall; pale gray to white with dark flaky grains and rusty yellow-brown patches, vitreous to pearly luster, and an irregular foliated/granular texture. The image does not clearly show diagnostic cleavage or crystal faces.

Identified September 22, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sedimentary rock was recrystallized during regional metamorphism, commonly during ancient mountain-building events; its exact age cannot be determined visually.

Uses & applications

Usually a common hand specimen with little commercial value; comparable rocks may be crushed for aggregate or used as building/decorative stone if sufficiently sound.

Geological facts

The dark reflective material may be biotite or muscovite mica, while the rusty coloration likely represents oxidized iron minerals. A broken surface and mixed grains make precise identification uncertain without testing.

Field identification & locations

Look for abundant interlocking quartz, visible mica flakes, and possible foliation; a steel file should scratch weaker grains but not quartz. Common in metamorphic mountain belts worldwide, including the Appalachians, Rockies, and ancient shields.