mineral

Quartz Pebble (likely Chalcedony or Quartzite)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: translucent white to peach/orange; Luster: waxy to vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: translucent white to peach/orange
Luster: waxy to vitreous

Identified April 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal fluids or as a secondary mineral in volcanic or sedimentary rocks. This specimen is water-worn, indicating it was smoothed by river or beach action.

Uses & applications

Used primarily for decorative purposes, landscape gravel, or tumble-polishing. Larger, purer deposits are used in glass-making and electronics.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. This specific rounded shape suggests long-term transport in high-energy water environments like a riverbed.

Field identification & locations

Identify in the field by its hardness (will scratch steel and glass) and lack of cleavage. It has a distinctive waxy 'soapy' feel when weathered. Commonly found in riverbeds, gravel pits, and beaches worldwide.

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