metamorphic

Quartz-veined metamorphic rock, likely schist or phyllite

Quartz-bearing mica schist/phyllite; exact identification requires closer examination

AI-generated identification · may be incorrect

Fine-grained, gray-green, foliated surface with a white quartz vein and rusty-brown iron-oxide staining. Likely contains quartz and mica/chlorite; hardness varies with composition, with quartz about 7 Mohs and mica about 2–3.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich sedimentary rock was buried and metamorphosed by heat and pressure; a later fracture was filled by quartz-bearing fluids. Age cannot be determined from the image.

Uses & applications

Similar rocks are used as decorative stone, landscaping material, and building stone; this small specimen is mainly suitable for collecting.

Geological facts

The white band is consistent with quartz deposited in a crack, while the brown coloration likely reflects oxidized iron minerals.

Field identification & locations

Look for planar, subtly shimmering foliation and a contrasting, harder white vein; quartz-veined schist and phyllite occur in many metamorphic belts worldwide. Small common specimens typically sell for about $2–$15 USD.