sedimentary
Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, waxy to vitreous luster, translucent to opaque, conchoidal fracture, colorless to greyish-white with weathering rinds.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, translucent to opaque, conchoidal fracture, colorless to greyish-white with weathering rinds.
Formation & geological history
Formed via deposition and microcrystalline precipitation in silica-rich solutions within cavities or as rounded detrital clasts shaped by water transport over millions of years.
Uses & applications
Used in lapidary arts, gravel, decorative stones, and scientific applications.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Commonly found in stream beds, river gravels, and beaches. Easily identified by its hardness, scratching glass, and conchoidal fracture.
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