mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale. Color: Translucent yellowish-white to honey-toned. Luster: Vitreous (glassy) to waxy when weathered. Crystal structure: Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Translucent yellowish-white to honey-toned
Luster: Vitreous (glassy) to waxy when weathered

Identified June 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal veins or as a primary constituent in igneous rocks like granite. This specimen shows significant rounding and frosting due to alluvial or beach erosion (water transport).

Uses & applications

Used as an abrasive, in glass making, electronics, and as a common decorative pocket stone or garden pebble.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These rounded pebbles are often called 'river glass' or 'sea quartz' depending on where they were found.

Field identification & locations

Identify in the field by its hardness (will scratch glass/steel) and the lack of cleavage planes. Found globally in riverbeds, beaches, and glacial till. Common everywhere but a staple for beginning collectors.