mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, granular and glassy-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. Rust-colored specks are likely iron-oxide staining or inclusions.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous fluids and hydrothermal veins, or accumulates as a durable weathering and stream-transport pebble. Its exact age and locality cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as lapidary or teaching specimens rather than fine gemstones.

Geological facts

Quartz is among the most abundant continental minerals and strongly resists chemical weathering, allowing it to survive as rounded sand and pebbles.

Field identification & locations

Identify it by its hardness—scratches ordinary glass—lack of cleavage, pale translucency, and conchoidal fracture; calcite would be much softer and react with acid. Common worldwide, especially in quartz veins, granites, and stream gravels.