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, usually massive rather than visibly crystalline. No cleavage, conchoidal fracture, and specific gravity about 2.65; the rounded shape indicates tumbling or polishing.

Identified August 25, 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; milky appearance comes from microscopic fluid inclusions or fractures. Quartz is common from Precambrian rocks through modern geological settings.

Uses & applications

Used for ornamental stones, tumbled specimens, countertops, glass, ceramics, electronics, and industrial silica. This small polished piece has modest decorative or educational value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical stress.

Field identification & locations

Identify it by its glassy/waxy surface, lack of cleavage, hardness sufficient to scratch glass, and inability to be scratched by a steel knife. Common worldwide, especially in hydrothermal veins and quartz-rich rocks.