mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely massive milky quartz with minor iron staining

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream, opaque, and typically vitreous to greasy luster. It has a trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity is about 2.65.

Identified September 15, 2026More mineral →

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Physical properties

Hardness 7 Mohs; white to cream, opaque, and typically vitreous to greasy luster. It has a trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity is about 2.65.

Formation & geological history

Forms when silica-rich hydrothermal fluids crystallize in veins and cavities, commonly within igneous or metamorphic rocks. The rounded shape indicates weathering and stream or surface transport; its precise geological age cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive specimens or lapidary material. This small rough fragment has minimal commercial value.

Geological facts

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

Field identification & locations

Identify it by its white translucency, glassy fracture, lack of cleavage, and ability to scratch ordinary glass; a steel knife will not scratch it. Common worldwide, especially in quartz veins, granite terrains, and stream gravels.