mineral
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, waxy to vitreous luster, yellowish-white to milky color, microcrystalline to macrocrystalline quartz structure, conchoidal fracture, specific gravity ~2.65.
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Physical properties
Hardness of 7 on Mohs scale, waxy to vitreous luster, yellowish-white to milky color, microcrystalline to macrocrystalline quartz structure, conchoidal fracture, specific gravity ~2.65.
Formation & geological history
Formed in hydrothermal veins or pegmatites as silica-rich fluids cooled and precipitated. Later eroded, weathered, and water-worn into a rounded pebble in a stream, river, or coastal environment.
Uses & applications
Used primarily as a decorative stone, lapidary material, or pocket specimen for rock collectors.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Rounded beach or river pebbles often feature small cavities (vugs) where crystalline quartz or chalcedony original structure remains preserved against weathering.
Field identification & locations
Can be identified by its ability to scratch glass (hardness 7), lack of cleavage, and translucent yellow-white quartzite/quartz host with an exposed crystalline pocket. Commonly found in gravel beds, rivers, and beaches worldwide.
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