metamorphic
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: tan to yellowish-brown with translucent patches, Luster: vitreous to waxy (when wet/polished), Crystal Structure: granular/microcrystalline, Cleavage: none, Specific Gravity: approx. 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: tan to yellowish-brown with translucent patches, Luster: vitreous to waxy (when wet/polished), Crystal Structure: granular/microcrystalline, Cleavage: none, Specific Gravity: approx. 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often found as water-worn pebbles in riverbeds or beach deposits.
Uses & applications
Commonly used as high-grade construction aggregate, decorative landscaping stone, and occasionally for lapidary tumbling for beginners.
Geological facts
Quartzite is so durable that it often outlasts the mountains it was formed in, becoming rounding pebbles that travel hundreds of miles down rivers.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary texture on a fresh break. Commonly found in riverbeds and glacial till throughout North America and Europe.
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