metamorphic
Quartz Vein Pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, white and brownish-grey coloration, vitreous 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 and brownish-grey coloration, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65
Formation & geological history
Formed by hydrothermal processes where silica-rich fluids precipitated quartz into fractures and fissures within host rocks, later weathered and rounded into a pebble by water transport
Uses & applications
Used as landscape decoration, tumbled stones, aggregate, and occasionally in glassmaking or electronics when pure
Geological facts
Quartz veins are the primary source of hydrothermal gold deposits, often hosting native gold in association with the quartz matrix
Field identification & locations
Easily identifiable in the field by its high hardness (scratches glass), lack of reaction to acid, and characteristic white or translucent appearance contrasting with surrounding rock
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