mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, transparent to translucent color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified July 30, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, transparent to translucent color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Quartz is highly resistant to weathering and chemical breakdown, allowing it to survive transportation in streams and rivers to form smooth pebbles.

Uses & applications

Used in glassmaking, electronics, abrasives, gemstone carvings, and as decorative landscape aggregate.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust, surpassed only by feldspar. Due to its piezoelectric properties, quartz is widely used in watches and oscillators to measure precise frequencies.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and glassy luster. Found globally in riverbeds, beaches, and alluvial deposits. Collectors typically find them easily in almost any natural water body.