mineral

Tumbled quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; pale cream to translucent, with a glassy-to-waxy luster and no cleavage. It has a hexagonal crystal structure, though tumbling has rounded the visible form; specific gravity is about 2.65.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids, commonly during Precambrian to recent geological periods. This small piece appears water-worn or mechanically tumbled and polished.

Uses & applications

Used for decorative stones, lapidary items, countertops, glass, ceramics, and electronics; attractive specimens may be used in jewelry. As a common tumbled stone, it has modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant, allowing it to survive erosion and accumulate in river gravels and beaches.

Field identification & locations

Identify it by its pale translucent appearance, glassy luster, lack of cleavage, and ability to scratch ordinary glass; a steel blade should not scratch it. Common worldwide, especially in quartz veins, pegmatites, and alluvial gravels.