mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Tan, brownish, or cloudy white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Tan, brownish, or cloudy white
Luster: Vitreous to waxy

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Tan, brownish, or cloudy white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. This specimen shows signs of water-worn erosion, likely from a stream or riverbed.

Uses & applications

Used in construction as a component of concrete, in glassmaking, as an abrasive, and sometimes tumbled for decorative use or jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which has Slavic origins.

Field identification & locations

Identified in the field by its hardness (it can scratch glass), its lack of cleavage, and its waxy appearance when weather-worn. It is found globally in almost all geological environments.