mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Off-white, translucent grey, and pale yellow/brown iron-stained bands. Luster: Vitreous to greasy (tumbled/water-worn). Crystal Structure: Trigonal (microcrystalline/massive). Cleavage: None (conchoidal fracture). Specific gravity: ~2.65.

Hardness: 7 on Mohs scale
Luster: Vitreous to greasy (tumbled/water-worn)

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins, pegmatites, or igneous rocks, later eroded, rounded, and smoothed by wave or river action. Iron oxides have seeped into tiny fractures, causing yellowish-brown staining.

Uses & applications

Used as decorative river rock, landscaping gravel, aquariums, tumbling material for rockhounding hobbyists, and industrially as a source of silica.

Geological facts

Quartz is one of the most common and resistant minerals on Earth's surface. Because of its hardness and chemical stability, it survives long journeys down rivers and along coastlines, forming rounded pebbles like this one.

Field identification & locations

Identified by its ability to scratch glass (Mohs 7), lack of cleavage, translucent appearance, and smooth, water-rounded texture. Commonly found in riverbeds, gravel pits, beaches, and glaciated terrains worldwide.