mineral

Small tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), possibly iron-stained milky quartz

AI-generated identification · may be incorrect

Likely Mohs hardness 7, white to cream with a rusty reddish inclusion or surface stain, vitreous-to-waxy luster, and no obvious cleavage; quartz is trigonal crystalline, though tumbling obscures crystal form.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments over a wide range of geological ages; the specimen was likely naturally rounded or mechanically tumbled and may contain iron-oxide staining.

Uses & applications

Common quartz is used for glass, ceramics, abrasives, electronics, and decorative stone; this small piece has primarily nominal collecting or craft value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to accumulate in stream gravels and beaches.

Field identification & locations

Test cautiously with a steel file or knife: quartz should resist scratching, unlike calcite; common sources include river gravels, veins, pegmatites, and quartz-rich rocks worldwide.