mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent, with a glassy-to-waxy luster and conchoidal fracture; it lacks cleavage and has a trigonal crystal structure. The rounded shape indicates natural water wear or tumbling, though the specimen may be broken or polished.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky opacity results from microscopic fluid inclusions or fractures. Quartz is common from Precambrian to modern deposits worldwide.

Uses & applications

Used in glassmaking, ceramics, electronics, abrasives, and construction aggregate; attractive pieces are sold as inexpensive specimens or cabochons.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical potential under pressure.

Field identification & locations

Identify it by its white translucence, lack of cleavage, hardness, and ability to scratch ordinary glass; common sources include veins, granitic rocks, stream gravels, and beaches. The image alone cannot exclude white chalcedony or calcite, but the smooth translucent appearance favors quartz.