metamorphic

Likely weathered schist or gneiss fragment

Micaceous quartz-feldspar metamorphic rock; exact identification requires testing

AI-generated identification · may be incorrect

Coarse, foliated texture with brown oxidation, pale quartz/feldspar, and reflective mica; typical hardness is about 5–7, vitreous to pearly luster, and weak-to-moderate foliation rather than cleavage. The metallic-looking areas may be mica or iron-oxide staining, not necessarily metal.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when preexisting sedimentary or igneous rock was subjected to elevated heat and pressure, producing aligned mica and recrystallized quartz/feldspar; age cannot be determined from the image and may range from Precambrian to much younger.

Uses & applications

Commonly used as crushed aggregate, decorative stone, and occasionally building or landscape stone; attractive pieces may be collected, but this fragment has low commercial value.

Geological facts

The rusty brown coloration likely reflects weathering of iron-bearing minerals such as biotite or sulfides. Strong foliation and visible mica distinguish schist from massive granite.

Field identification & locations

Look for layers or aligned flaky minerals, a sparkly surface, and quartz-rich light bands; a hand lens, streak test, hardness test, and fresh broken surface would improve identification. Common in regional metamorphic belts worldwide.