mineral

Quartz Pebble with Drusy/Crystalline Pocket

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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.

Identified July 22, 2026More mineral →

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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.