metamorphic

Quartzite Pebble (River Siltstone/Quartzite)

Quartzite (SiO2 composition)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Tan, beige, brownish-yellow; Luster: Dull to waxy; Texture: Fine-grained, rounded by river erosion; Cleavage: None

Hardness: 7 on Mohs scale
Color: Tan, beige, brownish-yellow
Luster: Dull to waxy

Identified July 22, 2026More metamorphic →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan, beige, brownish-yellow; Luster: Dull to waxy; Texture: Fine-grained, rounded by river erosion; Cleavage: None

Formation & geological history

Formed from sandstone subjected to intense heat and pressure during regional metamorphism, then weathered and naturally rounded by stream or river transport.

Uses & applications

Commonly used in landscaping, river rock decor, aggregate for construction, and casual rock tumbling.

Geological facts

Stream-rounded quartzite pebbles are among the most durable rocks on Earth, easily surviving thousands of years of water transport.

Field identification & locations

Identified by its high hardness (scratches glass), smooth rounded shape, and fine quartz grain texture. Commonly found in riverbeds, lakeshores, and gravel deposits worldwide.