mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to cream, translucent, with a vitreous-to-waxy luster and no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates tumbling or natural abrasion, and the gray-white patch may be a fracture or minor inclusion.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky color commonly results from microscopic fluid inclusions. Quartz is abundant from Precambrian to recent deposits worldwide.

Uses & applications

Used for decorative stones, carvings, landscaping, countertops, and silica products; attractive pieces are sold as inexpensive collectibles or cabochon material.

Geological facts

Quartz is one of Earth’s most abundant minerals and has excellent scratch resistance, though it can fracture conchoidally rather than cleave.

Field identification & locations

Identify it by hardness, glassy fracture, lack of cleavage, and inability to scratch it with a steel knife while it can scratch glass. Common sources include Brazil, Madagascar, the United States, and alpine or hydrothermal veins.