metamorphic

Quartzite pebble

Quartzite (Silicon Dioxide, SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to waxy; Texture: Granular/Sugary; Crystal system: Hexagonal (microcrystalline)

Hardness: 7 (Mohs scale)
Color: White to translucent
Luster: Vitreous to waxy

Identified July 21, 2026More metamorphic →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to waxy; Texture: Granular/Sugary; Crystal system: Hexagonal (microcrystalline)

Formation & geological history

Formed from the metamorphism of quartz sandstone under high heat and pressure, causing quartz grains to recrystallize and fuse together. Often found in ancient mountain belts.

Uses & applications

Used as crushed stone for road construction, railroad ballast, and occasionally as a source of silica for glass manufacturing or as architectural stone.

Geological facts

Quartzite is one of the most durable and weather-resistant rocks on Earth. It is often confused with marble, but marble is softer and reacts with acid, while quartzite does not.

Field identification & locations

Identify by its extreme hardness (scratches glass) and its characteristic rounded but granular 'sugary' appearance when weathered or tumbled in water.