mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white or milky color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white or milky color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Often accumulates as resistant pebbles in streams and beaches due to weathering and high chemical stability.
Uses & applications
Used in glassmaking, abrasives, electronic components, lapidary arts, and ornamental gravel.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to chemical weathering allows it to survive long transport distances in river systems.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass), lack of cleavage, and glassy luster. Common worldwide in gravel bars, river beds, and coastal beaches.
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