mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, often massive with no visible cleavage and conchoidal fracture. The yellow-brown seam likely reflects iron-oxide staining or a minor inclusion.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous and metamorphic rocks; quartz is widespread from Precambrian to modern geological settings. Its rounded shape indicates human tumbling or natural abrasion.

Uses & applications

Used for ornamental stones, carvings, countertops, abrasives, glass, and electronics; attractive pieces are sold as inexpensive lapidary specimens.

Geological facts

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

Field identification & locations

Identify it by its glassy/waxy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel blade should not scratch it. Common worldwide, especially in quartz veins and pegmatites.