mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure (not visible after tumbling). Specific gravity is about 2.65.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal environments; the cloudy appearance comes from microscopic fluid inclusions or structural defects. Quartz is common from Precambrian to modern geological settings.

Uses & applications

Used as a durable ornamental and lapidary stone, bead, cabochon, and inexpensive collectible; quartz also has major industrial uses in glass, ceramics, electronics, and abrasives.

Geological facts

The rounded shape indicates mechanical tumbling rather than natural crystal growth. Its bluish flashes may be surface reflections or minor inclusions, not necessarily gem-quality optical phenomena.

Field identification & locations

Identify it by testing that it scratches ordinary glass but not readily by a steel knife, lacks cleavage, and shows translucent white color with conchoidal fracture. Common worldwide, especially in quartz veins and granitic terrains.