metamorphic

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined schist; primarily SiO₂ with possible mica, feldspar, and iron oxides

AI-generated identification · may be incorrect

Hardness roughly 6.5–7 for quartz; gray, tan, and rusty-brown coloration, vitreous to dull luster, and granular/interlocking quartz texture. The elongated piece shows foliation or a prominent quartz vein, but its exact identity cannot be confirmed from the image alone.

Identified August 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sedimentary rock was metamorphosed under heat and pressure, with later fracturing and iron-oxide weathering. Age depends on its geological setting and cannot be determined visually.

Uses & applications

Common quartzite is used as aggregate, riprap, building stone, and occasionally decorative stone; attractive pieces may be collected, but this specimen appears ordinary.

Geological facts

Rusty brown zones commonly reflect oxidation of iron-bearing minerals along fractures or veins. Quartzite breaks irregularly and is generally harder than surrounding slate or shale.

Field identification & locations

Look for glassy quartz grains, poor reaction to dilute hydrochloric acid, and a scratch test against glass; strong planar mica layering would favor quartz-mica schist. Common in metamorphic mountain belts worldwide.