mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to cream, translucent-to-opaque, with a vitreous-to-waxy luster and no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates tumbling or natural water abrasion; dark spots may be inclusions or surface staining.
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Physical properties
Typically white to cream, translucent-to-opaque, with a vitreous-to-waxy luster and no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates tumbling or natural water abrasion; dark spots may be inclusions or surface staining.
Formation & geological history
Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky appearance results from microscopic fluid inclusions and fractures. Quartz is geologically widespread from ancient Precambrian rocks to modern sediments.
Uses & applications
Commonly used as a decorative stone, craft material, paper filler, glass raw material, and in some jewelry; this specimen appears to be a low-grade tumbled collectible.
Geological facts
Quartz is one of Earth’s most abundant minerals and forms the framework of many sands and rocks. Its hardness allows it to scratch ordinary glass and resist weathering.
Field identification & locations
Look for glass-like hardness, lack of cleavage, conchoidal fracture, and a cool, dense feel; a steel file should not easily scratch it. Common sources include Brazil, Madagascar, the United States, and sedimentary gravel deposits.
