metamorphic
Quartzite Pebble
Meta-quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: light grey with white streaks, Luster: dull to vitreous, Crystal structure: granular/interlocking, Cleavage: none, Specific gravity: approx 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: light grey with white streaks, Luster: dull to vitreous, Crystal structure: granular/interlocking, Cleavage: none, Specific gravity: approx 2.65
Formation & geological history
Formed from the metamorphism of quartz sandstone under intense heat and pressure, often associated with tectonic plate boundaries and mountain building (orogeny).
Uses & applications
Crushed stone for road construction, railroad ballast, tile/flooring, and as a decorative river rock in landscaping.
Geological facts
Quartzite is so durable that it often survives through multiple cycles of erosion and redeposition, remaining as rounded pebbles long after softer rocks have disintegrated.
Field identification & locations
Identify by its ability to scratch glass and its granular, crystalline texture that resembles sugar. Commonly found in riverbeds, glacial deposits, and mountain ranges.
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