mineral

Tumbled milky quartz

Quartz (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale gray, vitreous to waxy luster, hexagonal crystal structure, no true cleavage, conchoidal fracture, specific gravity about 2.65. The dark marks may be inclusions, surface pits, or matrix staining.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks; milky color results from microscopic fluid inclusions or fractures. The rounded shape indicates human tumbling and polishing, not a natural crystal form.

Uses & applications

Used as an ornamental, lapidary, and teaching specimen; quartz is also important in glassmaking, ceramics, electronics, and engineered stone. This piece has modest decorative value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant, commonly surviving erosion as sand and rounded stream pebbles.

Field identification & locations

Identify by its glassy appearance, translucency, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be confused with calcite, which is softer. Common worldwide, especially in granitic and hydrothermal regions.