mineral
Milky quartz pebble
Quartz (SiO₂), cryptocrystalline to massive variety
AI-generated identification · may be incorrectTypically white, translucent to opaque, with a vitreous-to-waxy luster and no visible cleavage; hardness 7 Mohs, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape indicates natural water wear or tumbling.
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Physical properties
Typically white, translucent to opaque, with a vitreous-to-waxy luster and no visible cleavage; hardness 7 Mohs, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape indicates natural water wear or tumbling.
Formation & geological history
Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky opacity results from microscopic fluid inclusions or fractures. Quartz is widespread from Precambrian terrains to modern river and beach deposits.
Uses & applications
Used for glass, electronics, abrasives, engineered stone, and construction aggregate; attractive pieces are collected or used in crafts and simple jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, commonly surviving as rounded stream gravel. This specimen’s plain white appearance is consistent with common milky quartz rather than a rare gemstone variety.
Field identification & locations
Identify by its white translucent appearance, glassy fracture, lack of cleavage, and ability to scratch ordinary glass; a steel blade generally will not scratch it. Common worldwide in quartz veins, granites, pegmatites, and alluvial gravels.
