metamorphic

Quartzite Pebble

Quartzite (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: tan to light brown with white quartz vein, Luster: dull to vitreous, Structure: non-foliated granular, Specific Gravity: 2.6-2.7

Identified July 7, 2026More metamorphic →

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Physical properties

Hardness: 7 (Mohs scale), Color: tan to light brown with white quartz vein, Luster: dull to vitreous, Structure: non-foliated granular, Specific Gravity: 2.6-2.7

Formation & geological history

Formed from the metamorphism of quartz sandstone under high heat and pressure, often found in riverbeds or coastal areas as water-worn pebbles.

Uses & applications

Landscaping, construction aggregate, and as a decorative river stone. Rounded pebbles are popular for 'worry stones'.

Geological facts

The white line visible is a quartz vein, formed when silica-rich fluids filled a fracture in the original rock and crystallized. Quartzite is tougher than its parent sandstone.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of visible grains compared to sandstone. Commonly found in glacial deposits and river systems.