metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, typically shades of white, gray, pink, or reddish-brown due to iron oxide impurities. Vitreous to greasy luster, massive crystal structure with interlocking quartz grains, lacks cleavage and breaks across grains, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically shades of white, gray, pink, or reddish-brown due to iron oxide impurities. Vitreous to greasy luster, massive crystal structure with interlocking quartz grains, lacks cleavage and breaks across grains, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz sandstone or chert under high temperature and tectonic pressure. Often weathered and rounded into pebbles by water action in rivers, streams, or coastal environments over millions of years.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally in road paving or as dimension stone. Common in lapidary work for tumbling.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why quartz-rich rocks often outlast other minerals to become smooth pebbles in riverbeds.
Field identification & locations
Can be identified by its extreme hardness (scratches glass easily), lack of effervescence with acid, and the sugary texture visible on broken surfaces. Found worldwide in ancient orogenic belts.
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