mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Mohs hardness of 7, yellowish to tan color due to iron oxide inclusions, vitreous to waxy luster when beach-worn, hexagonal crystal structure (microcrystalline/massive in pebbles), no cleavage, specific gravity around 2.65.
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Physical properties
Mohs hardness of 7, yellowish to tan color due to iron oxide inclusions, vitreous to waxy luster when beach-worn, hexagonal crystal structure (microcrystalline/massive in pebbles), no cleavage, specific gravity around 2.65.
Formation & geological history
Formed in hydrothermal veins or igneous/pegmatitic rock environments, then weathered, eroded, and rounded by stream or coastal ocean wave action over thousands to millions of years.
Uses & applications
Commonly collected as beach pebbles, used in decorative landscaping, lapidary polishing, and occasionally tumbled for craft jewelry.
Geological facts
Beach pebbles like this acquire their rounded, smooth shape through high-energy wave action, where sand and water act as natural abrasive media over extended periods.
Field identification & locations
Identified by its harness (scratches glass easily), smooth rounded shape, translucent body, and yellowish-iron tinting. Very common on ocean beaches, riverbeds, and gravel deposits worldwide.
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