metamorphic

Quartz-veined metamorphic rock, likely schist or gneiss

Micaceous quartz-feldspar rock; probable mica schist/gneiss with quartz veins

AI-generated identification · may be incorrect

Gray, foliated, fine-to-medium grained matrix with silvery mica sparkle and white massive quartz. Typical hardness is about 2–3 for mica and 7 for quartz; nonmetallic luster, cleavage in mica, and uneven fracture in quartz.

Identified September 19, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich or feldspathic sedimentary rock was buried, heated, and compressed during regional metamorphism; white quartz likely crystallized in later fractures. Exact geological age cannot be determined from the photograph.

Uses & applications

Commonly used as crushed aggregate, decorative stone, or locally as building facing; attractive pieces may be collected, though this specimen has little commercial value.

Geological facts

The contrasting white material is probably quartz, while the darker foliated portion may contain biotite, muscovite, quartz, and feldspar. Alternating mineral alignment indicates directed metamorphic pressure.

Field identification & locations

Look for planar foliation, mica flakes, and quartz-rich bands or veins; a steel nail may scratch mica-rich areas but not quartz. Common in mountain belts and exposed Precambrian terrains worldwide.