mineral

Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony

Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)

AI-generated identification · may be incorrect

Hardness 7 (quartz) or about 6.5–7 (chalcedony); translucent honey-brown to clear, vitreous to waxy luster, with no obvious cleavage and conchoidal fracture. The coloration likely comes from iron-oxide staining or inclusions.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica precipitated in cavities or fractures, later weathering into a stream pebble; the exact geological age and host rock cannot be determined from the photograph. Its rounded form indicates water transport.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive translucent pieces may be used as lapidary material or inexpensive specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to chemical and physical weathering, allowing it to accumulate in streambeds.

Field identification & locations

Look for glassy translucence, conchoidal fracture, lack of cleavage, and inability to scratch it with a steel knife; an iron-stained quartz pebble is common in stream gravels. A hardness or streak test would help distinguish it from calcite or colored glass.