mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, typically massive rather than visibly crystalline; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The smooth rounded shape indicates natural water wear or mechanical tumbling.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich igneous, metamorphic, or hydrothermal fluids; milky appearance results from microscopic fluid inclusions and fractures. Quartz is common throughout Earth’s geological history, from Archean rocks to modern sediments.

Uses & applications

Used for ornamental stones, lapidary items, countertops, glass, ceramics, and electronics; this small specimen has mainly decorative or educational value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins.

Field identification & locations

Identify it by its white translucency, hardness, lack of cleavage, and inability to scratch with a steel nail while scratching ordinary glass. Common worldwide in river gravels, veins, pegmatites, and quartz-rich rocks.