mineral

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, cream, or translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, cream, or translucent
Luster: Vitreous to waxy

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, cream, or translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed from cooling silica-rich magma or precipitation from hydrothermal veins. This specimen shows signs of water-worn erosion, likely formed over millions of years and rounded in a river or coastal environment.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a gemstone (amethyst, citrine). Common pebbles are used in landscaping and aggregate.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. It is chemically stable and physically resistant, which is why it often survives as pebbles after other minerals have weathered away.

Field identification & locations

Identify in the field by its hardness (will scratch glass) and lack of cleavage. Found globally in almost all geological settings, especially in riverbeds and beaches.