sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, yellowish-brown color due to iron oxide staining, vitreous to dull luster, cryptocrystalline to microcrystalline structure, conchoidal fracture with no true cleavage, and specific gravity of approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, yellowish-brown color due to iron oxide staining, vitreous to dull luster, cryptocrystalline to microcrystalline structure, conchoidal fracture with no true cleavage, and specific gravity of approximately 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent quartz-bearing rocks, typically over millions of years in high-energy fluvial, marine, or glacial environments.
Uses & applications
Used in landscaping, decorative aggregates, walkways, and rock tumbling or lapidary work by hobbyists.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, capable of surviving numerous cycles of weathering and erosion that destroy less resilient minerals.
Field identification & locations
Easily identified by its high hardness (scratches glass), smooth rounded shape from water tumbling, and lack of reaction to acid. Commonly found in riverbeds, beaches, and glacial till worldwide.
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Quartz pebble
Silicon dioxide (SiO2)
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Septarian Concretion containing Brachiopods/Crinoids
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Banded Siltstone / Mudstone Pebble
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