metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, color typically pinkish-brown to reddish due to iron oxide impurities, sub-vitreous to dull luster, massive or interlocking crystalline structure, lacks cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, color typically pinkish-brown to reddish due to iron oxide impurities, sub-vitreous to dull luster, massive or interlocking crystalline structure, lacks cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high temperatures and tectonic pressure, commonly over hundreds of millions of years in regional or contact metamorphic environments.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally as a polished pocket stone or specimen for rock collectors.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich rocks often survive long periods of river or beach transport to become smooth, rounded pebbles.
Field identification & locations
Can be identified in the field by its hardness (scratches glass easily), lack of effervescence with acid, and the sugary texture of fractured surfaces. Commonly found along riverbeds, beaches, and ancient sedimentary basins.
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