mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, commonly massive rather than visibly crystalline; Mohs hardness 7, no cleavage, conchoidal fracture, specific gravity about 2.65. The rounded shape indicates tumbling or natural abrasion.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky appearance results from microscopic fluid inclusions or fractures. Quartz is found in rocks ranging from Precambrian to modern geological ages.

Uses & applications

Used for ornamental carvings, spheres, tumbled stones, countertops, glass, ceramics, and electronics; attractive translucent pieces have modest lapidary and collecting value.

Geological facts

It is chemically the same mineral as clear rock crystal, amethyst, and citrine; color and transparency mainly reflect impurities and inclusions.

Field identification & locations

Identify by its glassy appearance, hardness, lack of cleavage, and ability to scratch ordinary glass; it should not be scratched by a steel knife. Common worldwide, especially in quartz veins, pegmatites, and gravel deposits.