mineral

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically white to cream, translucent to opaque, with a vitreous-to-waxy luster; hardness 7 Mohs, trigonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded shape indicates natural abrasion or tumbling.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich igneous, hydrothermal, or metamorphic fluids and is highly resistant to weathering; the specimen’s exact geological age and source cannot be determined visually. It may derive from a quartz vein or quartz-rich alluvial gravel.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, countertops, and decorative objects; attractive tumbled pieces are used in jewelry and collections. This small specimen has modest commercial value.

Geological facts

Milky opacity results mainly from microscopic fluid inclusions, fractures, or defects. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify it by its white translucent appearance, glassy sheen, lack of cleavage, and ability to scratch ordinary glass; a steel file will not scratch it easily. Common worldwide, especially in quartz veins and river gravels.