mineral
Quartz Pebble with Mineral Inclusions
Silicon Dioxide (SiO2)
Hardness 7 on the Mohs scale, vitreous to greasy luster, trigonal crystal system, white to grey color with dark vein-like inclusions, no distinct cleavage, Conchoidal fracture.
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Physical properties
Hardness 7 on the Mohs scale, vitreous to greasy luster, trigonal crystal system, white to grey color with dark vein-like inclusions, no distinct cleavage, Conchoidal fracture.
Formation & geological history
Formed through hydrothermal activity where silica-rich fluids cooled and crystallized in veins within host rocks. Later eroded by water action into a smooth, rounded beach pebble.
Uses & applications
Commonly collected by beachcombers, used as decorative river stones, or used as raw material for lapidary and gemstone polishing.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Rounded beach pebbles like this undergo thousands of years of natural water erosion to achieve their smooth texture.
Field identification & locations
Identified by its high hardness (scratches glass), waxy to glassy luster, white/translucent body, and dark carbonaceous or metallic mineral veins running through it. Commonly found along riverbeds, coastlines, and gravel deposits.
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