mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: colorless to milky white/tan; Luster: vitreous; Crystal structure: trigonal/hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: colorless to milky white/tan
Luster: vitreous

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: colorless to milky white/tan; Luster: vitreous; Crystal structure: trigonal/hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from cooling magma or hydrothermal veins; this specific specimen is likely a water-worn river pebble or piece of weathered gravel from various geological eras.

Uses & applications

Used extensively in glassmaking, electronics (oscillators), construction as aggregate, and as a popular semi-precious gemstone for decorative use.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the Greek word 'krystallos', meaning ice, as ancient Greeks believed quartz was permanently frozen water.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Commonly found in riverbeds, beaches, and soil worldwide. Collectors should look for clarity or unique inclusions.