mineral

Quartz-rich rock fragment

Likely milky quartz or quartz-rich vein material (SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Pale white to translucent with a brownish band and a glassy-to-dull luster. Quartz has Mohs hardness 7, a hexagonal crystal structure, and no cleavage; this small broken fragment shows no distinct crystal faces.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids deposited quartz in a crack in older rock; the specimen’s age and source cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, construction aggregate, and ornaments; this fragment appears to have little commercial value.

Geological facts

Quartz commonly breaks with curved, shell-like fracture surfaces rather than splitting along cleavage planes.

Field identification & locations

Check for hardness by testing whether it scratches glass, and look for conchoidal fracture; common in veins and many rock types worldwide. The visible band may be staining or an inclusion, not a reliable identifier.