mineral

Quartz pebble

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: milky white to clear. Luster: vitreous (glassy). Crystal structure: trigonal (often found massive). Cleavage: none (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: milky white to clear
Luster: vitreous (glassy)

Identified September 19, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: milky white to clear. Luster: vitreous (glassy). Crystal structure: trigonal (often found massive). Cleavage: none (conchoidal fracture). Specific gravity: 2.65.

Formation & geological history

Formed from crystallizing magma or hydrothermal veins. Found globally in almost all geological environments. Weathered from host rock and rounded by water transport.

Uses & applications

Often collected as tumbled stones, used in landscaping, and some varieties used in jewelry. A major component in glass making and electronics.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to weathering, which is why it often remains as sand or pebbles after other minerals have eroded away.

Field identification & locations

Identify by its hardness (can scratch glass) and lack of cleavage. Often found in riverbeds, beaches, and glacial deposits. Common and easy for beginners to identify.