mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and specific gravity about 2.65. The irregular, rounded shape suggests a naturally weathered or tumbled fragment.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; its broad geological age range includes nearly all of Earth’s history. Milky appearance results from microscopic fluid inclusions, fractures, or defects.

Uses & applications

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

Geological facts

Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins. This photograph alone cannot confirm whether it is quartz rather than a similar white mineral.

Field identification & locations

Check for glassy luster, hardness sufficient to scratch ordinary glass, and conchoidal fracture; calcite or gypsum will not scratch glass. Common worldwide, especially in stream gravels, granite terrains, and hydrothermal veins.