Rock Identifier
Quartz Pebble (Silicon Dioxide (SiO2)) — mineral
mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Milky white to translucent with some yellowish oxidation; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (though water-worn); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness
7 (Mohs scale)
Color
Milky white to translucent with some yellowish oxidation
Luster
Vitreous to waxy
Identified More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Milky white to translucent with some yellowish oxidation; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (though water-worn); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen has been rounded by fluvial processes (water erosion) and is likely part of a quaternary sedimentary deposit.

Uses & applications

Used in glassmaking, electronics, abrasives, and common landscaping gravel. High-purity quartz is used for silicon wafers in technology.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge in response to applied mechanical stress.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till globally.

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