mineral

Tumbled milky quartz (likely quartzite or chalcedony-rich stone)

Quartz, SiO₂

AI-generated identification · may be incorrect

White to pale gray, opaque to translucent, with a waxy-to-glassy luster and irregular gray inclusions or surface pits. Quartz has hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure; the rounded shape indicates tumbling or water wear.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments through silica crystallization; quartzite forms when sandstone recrystallizes during metamorphism. Precise age and locality cannot be determined from the photograph.

Uses & applications

Used for decorative stones, countertops, abrasives, glass, ceramics, and electronics; attractive tumbled pieces are inexpensive collectibles.

Geological facts

The specimen appears to contain dark mineral inclusions or weathered matrix, which may make it quartzite rather than pure quartz. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify by its white color, lack of cleavage, glassy/waxy surface, and ability to scratch ordinary glass; a steel blade should not scratch it. Common worldwide, especially in hydrothermal veins, sandstone-derived quartzite, and gravel deposits.