metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale), Color: tan to creamy white with yellow staining, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Identified More metamorphic →
Explore Quartzite Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale), Color: tan to creamy white with yellow staining, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Heat and pressure recrystallize the sand grains into a dense, crystalline mesh. This specific specimen has been further smoothed and rounded by fluvial or glacial transport.
Uses & applications
Used as aggregate in construction, as decorative river rock in landscaping, and occasionally as a source of silica for glass making.
Geological facts
Quartzite is so tough that it often survives intense weathering and transport that destroys other rocks. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify in the field by its hardness and granular, sparkling 'sugary' texture on a fresh break. It is very common in riverbeds and glacial deposits throughout North America and Europe.
