mineral

Tumbled milky quartz (likely iron-stained)

Quartz — silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent cream to honey-yellow color, vitreous to waxy luster, hexagonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65. Rounded edges indicate tumbling or natural water abrasion.

Identified September 3, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich hydrothermal fluids or igneous/metamorphic processes; the cloudy appearance comes from microscopic fluid inclusions, while yellow coloration likely reflects iron staining. Quartz ranges from Precambrian to recent in age and occurs worldwide.

Uses & applications

Used as a decorative tumbled stone, lapidary material, glass and ceramic silica, and occasionally jewelry; this small common piece has minimal commercial value.

Geological facts

Milky quartz is cloudy because inclusions scatter light; its hardness allows it to scratch ordinary glass and resist weathering.

Field identification & locations

Identify it by its glassy sheen, hardness, lack of cleavage, and conchoidal fracture; common sources include Brazil, Madagascar, the United States, and alpine or hydrothermal veins. Estimated value: $1–$10 for a common tumbled specimen.