metamorphic
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
Hardness: 7 (Mohs), Color: creamy yellow to tan/brown due to iron staining, Luster: Vitreous to waxy, Crystal structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.6-2.7.
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Physical properties
Hardness: 7 (Mohs), Color: creamy yellow to tan/brown due to iron staining, Luster: Vitreous to waxy, Crystal structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.6-2.7.
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure. This specific specimen has been further shaped and polished through aqueous erosion in a river or beach environment.
Uses & applications
Used as decorative gravel in landscaping, as a construction aggregate, and occasionally as a tumbling stone for beginner rock collectors.
Geological facts
Quartzite is so hard that it can scratch steel. This specimen shows a 'water-worn' texture, meaning it spent thousands of years being tumbled by moving water. It is one of the most durable and resistant rocks on Earth's surface.
Field identification & locations
Identify by its hardness (it will easily scratch glass) and its granular, sugary texture when broken. Common globally in riverbeds and glacial tills. Look for the smooth, rounded exterior and characteristic 'stained' appearance.
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