metamorphic
Quartz-veined dark metamorphic rock, likely schist
Quartz–mica schist (probable); visible light veins are quartz, with possible iron-oxide staining
AI-generated identification · may be incorrectDark gray, foliated matrix with white, irregular quartz-rich patches and rusty yellow-brown staining. Likely quartz, mica, and other silicate minerals; hardness varies, with quartz at Mohs 7. Individual crystal structure and specific gravity cannot be determined from the image.
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Physical properties
Dark gray, foliated matrix with white, irregular quartz-rich patches and rusty yellow-brown staining. Likely quartz, mica, and other silicate minerals; hardness varies, with quartz at Mohs 7. Individual crystal structure and specific gravity cannot be determined from the image.
Formation & geological history
Formed when clay-rich or volcanic sedimentary material was buried, heated, and deformed; quartz-filled fractures and iron staining formed later. Its age cannot be identified from appearance alone.
Uses & applications
Schist is used locally as decorative stone, paving, and landscaping material; quartz veins are of geological interest but are not evidence of economic-grade ore.
Geological facts
Quartz commonly fills cracks as silica-bearing fluids cool; iron oxides can produce ochre-colored staining along the vein.
Field identification & locations
Look for aligned mica flakes or other minerals giving the rock a layered, foliated texture, crossed by harder, often pale quartz veins. Schist and quartz veins occur in many metamorphic belts worldwide; a hand lens and fresh surface help confirm identification.
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