metamorphic

Quartz-rich metamorphic rock (likely quartzite)

Quartzite, composed mainly of quartz (SiO₂); exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Gray-white, rough and irregular, with a granular to crystalline texture and dull-to-glassy luster. Quartz has Mohs hardness 7 and a trigonal crystal structure; the specimen’s visible cavity and mixed coloration are not diagnostic.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure, typically during regional metamorphism. Its age and specific formation environment cannot be determined from the image.

Uses & applications

Quartzite is used as crushed stone, building and decorative stone, and sometimes as a silica source; this small irregular specimen is mainly suitable for collecting.

Geological facts

The visible pale grains and hard-looking texture are consistent with quartz-rich material, but a photograph cannot reliably distinguish quartzite from quartz-bearing vein rock or other rocks.

Field identification & locations

Test a fresh surface: quartz-rich quartzite should scratch glass and show fused-looking grains; identify the exact rock more confidently with a close-up or hardness test. Quartzite occurs worldwide in metamorphic terrains.