metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Grey, white, translucent; Luster: Vitreous to waxy; Structure: Crystalline/Granoblastic; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7

Hardness: 7 on Mohs scale
Color: Grey, white, translucent
Luster: Vitreous to waxy

Identified July 12, 2026More metamorphic →

Explore Quartzite Pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: Grey, white, translucent; Luster: Vitreous to waxy; Structure: Crystalline/Granoblastic; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7

Formation & geological history

Formed through the metamorphism of quartz sandstone under high heat and pressure. This specimen shows signs of mechanical weathering (rounding) in a river or coastal environment.

Uses & applications

Commonly used in construction as crushed stone, in landscaping, and occasionally as a base for low-cost river rock decor.

Geological facts

Quartzite is so hard that it can scratch glass and steel. It was sometimes used by prehistoric humans to create stone tools when flint was unavailable.

Field identification & locations

Identify by its hardness (will not react to acid like limestone) and grainy, crystalline appearance. Found globally in ancient mountain belts and riverbeds.