mineral

Likely pale quartz or quartzite pebble

Quartz (SiO₂), possibly a quartz-rich rock such as quartzite

AI-generated identification · may be incorrect

Small, rounded cream-white specimen with a dull to slightly waxy surface; the image is too soft to assess grain or cleavage. Quartz hardness is 7 Mohs, with no cleavage and a glassy luster when freshly broken.

Identified October 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in many igneous, metamorphic, and sedimentary settings; quartzite forms when sandstone is metamorphosed. Its age and specific origin cannot be determined from the photograph.

Uses & applications

Quartz and quartzite are used in glassmaking, construction aggregate, and decorative stone; this small pebble is mainly suitable for collecting.

Geological facts

Quartz is one of Earth’s most abundant minerals and breaks with a curved, conchoidal fracture rather than cleavage.

Field identification & locations

The rounded shape suggests abrasion during transport, but the photograph does not show enough detail for a confident identification. The reported location is in California’s southern Sierra region, where quartz-rich rocks and stream pebbles are plausible; check for glassy fracture and lack of fizz in dilute acid.