mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Small, translucent-to-milky white fragment with a glassy luster and irregular fracture; crystal faces are not clear in the photo. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally broken and water-worn quartz fragment; quartz forms in many igneous, metamorphic, and sedimentary settings and is geologically widespread. Its age cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and construction aggregate; attractive pieces may be kept as inexpensive curiosities.

Geological facts

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

Field identification & locations

The appearance is consistent with common quartz, but the small, rounded specimen is not diagnostic; a scratch test against glass (quartz should scratch it) can help. Quartz is plausible around the reported Baja California location, though the exact source cannot be inferred.