mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. This rounded, opaque piece appears tumbled and may also be a pale quartzite or calcite, though quartz is the best visual match.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic processes; individual crystals range from ancient to recent depending on the host rock. Tumbled specimens are mechanically polished from natural fragments.

Uses & applications

Common in decorative stone, countertops, abrasives, glass, electronics, and lapidary work; milky quartz is inexpensive jewelry and carving material.

Geological facts

Quartz is one of Earth’s most abundant minerals and produces piezoelectric effects when mechanically stressed.

Field identification & locations

Found worldwide, especially in granitic and metamorphic terrains; quartz scratches glass, while calcite does not. The image alone cannot confirm identity without hardness and acid tests.