mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to off-white color with some dark staining, 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 to off-white color with some dark staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through precipitation from silica-rich solutions or as a primary component of igneous, metamorphic, and sedimentary rocks. This specific specimen has been weathered and rounded by water action in a stream or beach environment over geological time.
Uses & applications
Used in landscaping, decorative gravel, glassmaking, and occasionally as a tumbling rough for hobbyists.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust. Its high resistance to chemical and mechanical weathering allows it to survive long transport distances in rivers and oceans.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass), lack of cleavage, and resistance to acid. Commonly found in riverbeds, beaches, and glacial outwash.
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