sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or light tan in color, vitreous to greasy luster, hexagonal crystal system when unweathered, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or light tan in color, vitreous to greasy luster, hexagonal crystal system when unweathered, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through intense weathering and erosion of parent igneous, metamorphic, or older sedimentary rocks, followed by prolonged water transport in rivers, streams, or marine environments that smooths and rounds the fragments.
Uses & applications
Used in landscaping, decorative stone, glass manufacturing, abrasives, and sometimes as a tumbled worry stone or polished lapidary specimen.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to both chemical weathering and physical abrasion is why it survives long transport to become a smooth pebble.
Field identification & locations
Easily identified by its lack of reaction to acid, high hardness (scratches glass easily), and smooth water-worn shape. Found globally in riverbeds, beaches, and alluvial deposits.
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