mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂), likely a vein-quartz fragment

AI-generated identification · may be incorrect

Identified October 2, 2026More mineral →

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Physical properties

Mostly white to translucent gray, with a vitreous-to-waxy luster and irregular fracture; no obvious cleavage. Quartz has Mohs hardness 7 and a hexagonal crystal structure, though individual crystals are not visible here. The pebble’s rounded, worn shape and surface coating make identification from the photo less certain.

Formation & geological history

Likely formed as quartz in a rock fracture or vein, then released and rounded by weathering and transport. Quartz veins can form across many geological ages; the specimen’s age cannot be determined visually.

Uses & applications

Commonly collected; quartz is also used in glass, electronics, abrasives, and ornamental objects.

Geological facts

Quartz is one of Earth’s most abundant minerals and breaks with curved, shell-like (conchoidal) surfaces rather than splitting along cleavage planes.

Field identification & locations

The pale, glassy interior and lack of visible cleavage fit quartz, but the image cannot rule out another silica-rich pebble or a coating. Quartz is plausible in the region near the reported coordinates; confirm hardness only by testing an inconspicuous spot, since quartz can scratch glass.