mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Identified August 5, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through crystallization in igneous rocks like granite or through precipitation in sedimentary environments. Highly resistant to weathering, allowing it to survive transport in rivers and streams to form rounded pebbles.

Uses & applications

Used in glassmaking, electronics, abrasives, gemstones, and ornamental landscaping.

Geological facts

Quartz is one of the most abundant and durable minerals in the Earth's continental crust. Its piezoelectric properties make it essential in timing and electronic devices.

Field identification & locations

Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and characteristic conchoidal fracture. Found worldwide in riverbeds, beaches, and various rock formations.