mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with irregular conchoidal fractures; Mohs hardness 7, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape indicates natural abrasion or tumbling.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly during igneous and metamorphic activity; quartz is abundant from Precambrian to recent ages. This specimen was likely transported and weathered in a stream, beach, or gravel deposit.

Uses & applications

Used in glass, ceramics, abrasives, foundry materials, electronics, and engineered stone; attractive pieces are sold as inexpensive decor or lapidary material.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify by its hardness, lack of cleavage, glassy fracture, and inability to be scratched by a steel knife; it should scratch ordinary glass. Common worldwide, especially in quartz veins, granites, metamorphic rocks, and river gravels.