mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-waxy luster, massive texture, and no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The brown patches are likely iron-oxide staining or attached matrix.
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Physical properties
Typically white to translucent with a vitreous-to-waxy luster, massive texture, and no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The brown patches are likely iron-oxide staining or attached matrix.
Formation & geological history
Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal environments; this rounded specimen was likely weathered and transported in sediment. Quartz is common from Precambrian through modern geological settings.
Uses & applications
Used for glass, ceramics, abrasives, engineered stone, and aggregate; attractive pieces are collected, though this specimen has little jewelry value.
Geological facts
Quartz is one of Earth’s most abundant minerals and has a distinctive conchoidal fracture. It can scratch ordinary steel or glass, helping distinguish it from softer white minerals.
Field identification & locations
Common in river gravels, veins, granites, and metamorphic rocks worldwide. Identify it by hardness, lack of cleavage, translucent edges, and conchoidal fracture; a streak test is white.
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