mineral
Yellow Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
Hardness 7 on the Mohs scale, waxy to vitreous luster, translucent yellowish-brown to amber color, microcrystalline to cryptocrystalline texture, conchoidal fracture.
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Physical properties
Hardness 7 on the Mohs scale, waxy to vitreous luster, translucent yellowish-brown to amber color, microcrystalline to cryptocrystalline texture, conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica-rich fluids in volcanic cavities or sedimentary gravel beds. Frequently rounded and weathered by water action in riverbeds or ocean beaches.
Uses & applications
Used for lapidary arts, tumbling, jewelry making (cabochons), and general rock collecting.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface. Water-worn pebbles like this often exhibit micro-pitting from tumbling against other stones in rivers or coastal shores.
Field identification & locations
Can be identified by its hardness (scratches glass, cannot be scratched by a steel blade), translucent nature under light, and smooth, rounded surface. Commonly found in river deposits, gravel pits, and sea beaches worldwide.
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