mineral

Weathered quartz-rich pebble

Likely quartz (SiO₂), possibly a small quartzite or feldspathic rock fragment

AI-generated identification · may be incorrect

Hardness about 7 Mohs if quartz-dominant; pale tan, granular, and dull to slightly glassy, with no visible cleavage. The small, rounded specimen appears iron-stained and heavily weathered; crystal structure is likely trigonal quartz if monomineralic.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Probably a naturally weathered fragment from quartz vein material, sandstone, or quartzite; its exact geological age and source cannot be determined from the photograph. Iron-oxide staining commonly develops during surface weathering.

Uses & applications

Quartz-rich fragments are used industrially for glass, ceramics, abrasives, and aggregate; this specimen is mainly suitable as a teaching or casual collecting sample, with negligible jewelry value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to chemical and physical weathering, often accumulating in streambeds and soils as rounded pebbles.

Field identification & locations

Common in streams, gravel beds, weathered outcrops, and quartz veins worldwide. A steel file or knife should not readily scratch quartz, while quartz will scratch ordinary glass; a hand lens may reveal translucent grains or crystalline faces.