mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, translucent white to pale gray, with a vitreous luster and conchoidal fracture; the rounded shape suggests tumbling or natural abrasion. Crystal structure is trigonal, though individual crystal faces are not visible.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and sedimentary settings through crystallization from silica-rich fluids or cooling magma, and is extremely common in eroded gravel deposits. Its geological age cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are sold as inexpensive specimens or cabochons.

Geological facts

The cloudy appearance results from microscopic fluid inclusions, fractures, or impurities. Quartz is much harder than ordinary steel and can scratch glass.

Field identification & locations

Identify it by its glassy luster, lack of cleavage, curved fracture, and ability to scratch glass; common sources include river gravel, quartz veins, and pegmatites. The image is not detailed enough to exclude pale chalcedony or another translucent silicate.