metamorphic

Schist (likely mica schist)

Mica schist, commonly quartz–muscovite/biotite schist

AI-generated identification · may be incorrect

Typically composed of quartz, mica, and feldspar; Mohs hardness about 2–7 depending on mineral grains. The specimen shows strongly wavy, glittering foliated layers with brown-gold mica, earthy to vitreous luster, and easy splitting along schistosity.

Identified September 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sedimentary rock undergoes regional metamorphism under elevated temperature and pressure, commonly during mountain building. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, landscaping material, wall stone, and sometimes roofing or flagstone; attractive mica-rich pieces are collected but are rarely high-value.

Geological facts

The glitter comes from aligned mica flakes, while the contorted bands record intense deformation. Schistosity distinguishes it from massive granite and finer-grained slate.

Field identification & locations

Identify it by visible aligned flakes, pronounced layering, irregular cleavage, and a sparkly surface; common in metamorphic mountain belts worldwide. A hand lens and streak/acid tests help confirm minerals, but avoid assuming the gold color is native gold.