metamorphic
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
Hardness: 7 (Mohs scale), Color: White to light grey, Luster: Vitreous to dull when water-worn, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: White to light grey, Luster: Vitreous to dull when water-worn, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism (heat and pressure) of quartz-rich sandstone. This specific specimen has been rounded and smoothed by water action in a river or coastal environment.
Uses & applications
Used as a decorative landscape stone, in construction aggregates, and historically as a tool-making material for flintknapping when chert was unavailable.
Geological facts
Quartzite is one of the hardest and most durable rocks common on the Earth's surface. It is so tough that it often outlasts the surrounding rocks, leaving behind rounded 'cobbles' or 'pebbles' across landscapes.
Field identification & locations
Identify in the field by its ability to easily scratch glass and its grainy, 'sugary' texture under a magnifying lens. Commonly found on beaches and in riverbeds worldwide.
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