metamorphic

Quartzite Pebble

Quartzite (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: dirty white to light tan; Luster: dull to vitreous; Structure: granular/crystalline; Cleavage: none (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: dirty white to light tan
Luster: dull to vitreous

Identified July 15, 2026More metamorphic →

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Physical properties

Hardness: 7 on Mohs scale; Color: dirty white to light tan; Luster: dull to vitreous; Structure: granular/crystalline; Cleavage: none (conchoidal fracture).

Formation & geological history

Formed from quartz-rich sandstone subjected to intense heat and metamorphic pressure that fuses quartz grains together. This specific piece has been smoothed by fluvial or coastal water action.

Uses & applications

Commonly used in landscaping, as decorative garden stones, and as a raw material in construction or glass manufacturing when found in bulk.

Geological facts

Quartzite is one of the hardest and most durable common rocks. This specimen is a 'river rock' or 'tumble', showing a smooth rind resulting from thousands of years of abrasion in water.

Field identification & locations

Identify by its ability to scratch glass and its grainy, sugary appearance despite the smooth exterior. Found globally along riverbeds, beaches, and glacial deposits.