mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to waxy (when weathered)

Identified June 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen is a 'river rock' or 'tumble-polished' by natural water erosion, likely dating from various geological eras based on its source bedrock.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative river stone in landscaping or as a collector's pocket stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as smooth pebbles after other minerals have decomposed.

Field identification & locations

Identify by its ability to scratch glass (hardness 7) and its lack of cleavage. Commonly found in riverbeds, beaches, and gravel pits worldwide. Collectors look for clarity or unique inclusions.