mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent gray, vitreous-to-waxy luster, massive microcrystalline structure, and no cleavage. The rounded shape and smooth surface indicate mechanical tumbling and polishing.

Identified September 17, 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; the specimen is likely geologically ancient but its exact age cannot be determined visually. Milky appearance results from microscopic fluid inclusions and structural defects.

Uses & applications

Used as an ornamental stone, lapidary material, countertop aggregate, and inexpensive cabochons or tumbled stones. It has modest jewelry value unless unusually clear or attractively patterned.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant, often surviving weathering as sand or rounded stream clasts. This piece could also be white chalcedony, but visible translucency and texture are consistent with massive quartz.

Field identification & locations

Identify by its glassy/waxy luster, lack of cleavage, and ability to scratch ordinary steel or glass; a streak is white. Common worldwide, especially in hydrothermal veins and granitic or metamorphic terrains.