mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to translucent grey, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent grey, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed in various geological environments including igneous intrusions, metamorphic veins, and as a primary component of many sedimentary rocks. This specimen is water-worn, indicating erosion and transport in a river or coastal environment.
Uses & applications
Commonly used as abrasive grit, in landscaping, glass manufacturing, and as tumbled decorative stones. Industrial applications include electronics and optical equipment.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which means 'hard'.
Field identification & locations
Identifiable by its inability to be scratched by steel, lack of cleavage, and smooth, rounded appearance when water-worn. Found globally in riverbeds and beaches.
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