metamorphic

Quartzite Pebble

Quartzite (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Pinkish-orange to tan due to iron oxide staining; Luster: Dull to slightly vitreous; Texture: Granular, sugary appearance; Specific gravity: approx 2.65

Hardness: 7 on Mohs scale
Color: Pinkish-orange to tan due to iron oxide staining
Luster: Dull to slightly vitreous

Identified July 18, 2026More metamorphic →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pinkish-orange to tan due to iron oxide staining; Luster: Dull to slightly vitreous; Texture: Granular, sugary appearance; Specific gravity: approx 2.65

Formation & geological history

Formed from the metamorphism of quartz sandstone under high heat and pressure. The original quartz grains recrystallize into a dense interlocking mosaic.

Uses & applications

Used as construction aggregate, high-quality road stone, and decorative landscaping stone. Historically used for making stone tools.

Geological facts

Quartzite is one of the most durable and weather-resistant rocks on Earth. This specific specimen has been rounded and smoothed by water erosion, likely in a river or beach environment.

Field identification & locations

Identifiable by its inability to be scratched by a steel knife and its lack of reaction to acid. Often found as rounded pebbles in gravel pits or riverbeds.