mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White/Translucent, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified March 21, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White/Translucent, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed from cooling of silica-rich magma or precipitation in hydrothermal veins. This specimen shows significant water-tumbled erosion, common in riverbeds or coastal beaches, often dating back millions of years depending on the parent rock source.

Uses & applications

Industrial use in glassmaking, electronics (quartz crystals), and abrasives. High-purity quartz is used in solar panels. Tumbled stones are used for aquarium gravel, landscaping, and lapidary hobbies.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical stress is applied, a property used in watches and radios.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Often found on beaches and in riverbeds as rounded 'sea glass' like stones. Collectors look for clarity or inclusions. Commonly found worldwide.