metamorphic

Quartz-rich rock, possibly milky quartz or quartzite

Predominantly quartz (SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Pale gray-white, rough and uneven, with a dull to slightly glassy luster. Quartz has Mohs hardness 7 and a trigonal crystal structure; the specimen shows no obvious cleavage.

Identified October 13, 2026More metamorphic →

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Physical properties

Pale gray-white, rough and uneven, with a dull to slightly glassy luster. Quartz has Mohs hardness 7 and a trigonal crystal structure; the specimen shows no obvious cleavage.

Formation & geological history

May be vein quartz formed from silica-rich fluids, or quartzite formed by metamorphism of sandstone; its age and origin cannot be determined from the image alone.

Uses & applications

Quartz-rich material is used in glassmaking, construction aggregate, and decorative stone; this small rough piece is mainly suitable for a collection.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly occurs in veins and many rock types.

Field identification & locations

Look for hardness that can scratch glass and a lack of cleavage; quartzite typically has interlocking grains, while vein quartz is more uniformly crystalline. Found worldwide.