mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to gray, opaque to slightly translucent, with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and trigonal crystal structure. The rounded shape indicates natural water wear or tumbling.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; this pebble was likely eroded from quartz vein material and transported by water. Quartz formed throughout geological time, commonly in Precambrian and younger rocks.

Uses & applications

Used as a decorative stone, lapidary material, filler, glass ingredient, and source material for engineered stone; this small specimen has mainly educational or craft value.

Geological facts

Milky quartz appears white because microscopic fluid inclusions and structural defects scatter light. It is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by its white color, glassy/waxy surface, lack of cleavage, and ability to scratch ordinary glass; a steel knife will not scratch it. Common in river gravels, quartz veins, granite terrains, and pegmatites.