mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: tan to yellowish-brown (likely due to iron staining), Luster: greasy to vitreous, Crystal Structure: hexagonal (trigonal), Gravity: 2.65.

Identified July 16, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: tan to yellowish-brown (likely due to iron staining), Luster: greasy to vitreous, Crystal Structure: hexagonal (trigonal), Gravity: 2.65.

Formation & geological history

Formed in various geological environments, commonly in cooling magma or hydrothermal veins. This specific specimen has been chemically or mechanically weathered and rounded by water transport in a river or stream environment.

Uses & applications

Commonly used in aggregates for construction, as a source of silica for glass manufacturing, and as an abrasive. Smooth pebbles are also used in landscaping and garden decor.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it is the primary component of most river sand and beach pebbles.

Field identification & locations

Identified by its hardness (cannot be scratched by a steel knife), lack of cleavage, and smooth, water-worn texture. Frequently found in riverbeds, glacial deposits, and sedimentary layers globally.