mineral

Small tumbled pale quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely Mohs hardness 7; off-white to translucent gray, with a vitreous-to-waxy polish and no visible cleavage. The rounded shape and smooth surface suggest tumbling; the photo does not show enough detail to confirm the exact quartz variety.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in many igneous, metamorphic, and sedimentary settings, crystallizing from silica-rich melts or fluids; its age depends on its source. This pebble was likely naturally rounded and subsequently polished in a tumbler.

Uses & applications

Commonly used for inexpensive jewelry, crafts, and collecting; quartz is also important in glassmaking and electronics.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a trigonal crystal structure, though tumbling hides its typical crystal faces.

Field identification & locations

A hard, glassy pebble with no cleavage is consistent with quartz; common sources include river gravels and quartz-rich rocks worldwide. A scratch test on an inconspicuous spot can help distinguish it from softer lookalikes.