mineral

Tumbled white quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, and commonly massive rather than visibly crystalline. It has a trigonal crystal structure, no true cleavage, conchoidal fracture, and specific gravity around 2.65.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; its geological age may range from ancient Precambrian to recent. The rounded shape indicates human tumbling or natural abrasion.

Uses & applications

Used as an inexpensive lapidary and decorative stone, crystal specimen, and occasional industrial silica source; it is generally not valuable jewelry material.

Geological facts

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

Field identification & locations

Identify it by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz veins and granitic terrains.