mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to translucent 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 to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through crystallization in igneous, metamorphic, and sedimentary environments. Quartz is highly resistant to weathering, allowing pebbles to form over millions of years of river or wave action.
Uses & applications
Used in landscaping, decorative stone, glassmaking, electronics, and sometimes cabochons for jewelry.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. The surface markings and cracks seen on this specimen are often referred to as chatter marks or glacial/alluvial wear.
Field identification & locations
Easily identified by its high hardness (scratches glass) and conchoidal fracture. Found worldwide in stream beds, beaches, and gravel deposits. Great for beginner rock collectors.
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