mineral
White quartz pebble (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent, vitreous-to-waxy luster, irregular conchoidal fracture, and no cleavage. The smooth rounded shape indicates natural abrasion or tumbling; exact identification is limited by the image.
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Physical properties
Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, irregular conchoidal fracture, and no cleavage. The smooth rounded shape indicates natural abrasion or tumbling; exact identification is limited by the image.
Formation & geological history
Quartz crystallizes from silica-rich igneous and hydrothermal fluids and commonly survives weathering as river, beach, or glacial pebbles. Quartz is geologically widespread and forms from Precambrian to modern times.
Uses & applications
Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive polished pieces are sold as inexpensive decorative or metaphysical specimens.
Geological facts
Milky quartz appears white because microscopic fluid inclusions, fractures, or defects scatter light. It can scratch ordinary glass and steel but not be scratched by a steel knife.
Field identification & locations
Look for glassy luster, high hardness, lack of cleavage, and conchoidal fracture; a streak test is white. Common sources include river gravels, beaches, and quartz veins worldwide.
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