metamorphic

Quartzite Pebble (or Quartz Pebble)

Quartzite (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: yellowish-tan to brownish-beige; Luster: waxy to vitreous; Crystal Structure: Trigonal (microcrystalline interlocked grains); Cleavage: none; Specific Gravity: ~2.65

Hardness: 7 on Mohs scale
Color: yellowish-tan to brownish-beige
Luster: waxy to vitreous

Identified July 27, 2026More metamorphic →

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Physical properties

Hardness: 7 on Mohs scale; Color: yellowish-tan to brownish-beige; Luster: waxy to vitreous; Crystal Structure: Trigonal (microcrystalline interlocked grains); Cleavage: none; Specific Gravity: ~2.65

Formation & geological history

Formed through the metamorphism of quartz-rich sandstone under extreme heat and pressure, recrystallizing quartz grains into a dense rock matrix. Water-worn and rounded through stream, river, or coastal erosion.

Uses & applications

Commonly used as construction aggregate, decorative landscaping stone, rock tumbling, and educational geological specimens.

Geological facts

Quartzite is extremely durable and resistant to chemical weathering. Water-smoothed quartz and quartzite pebbles are among the most widespread gravel components worldwide.

Field identification & locations

Identified by its ability to easily scratch glass (Mohs 7), sugary or interlocking granoblastic texture, and smooth, water-worn exterior. Commonly found in riverbeds, glacial deposits, and beaches.