mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent, with a vitreous-to-waxy luster and massive, non-crystalline appearance; hardness 7 Mohs, conchoidal fracture, no cleavage, and specific gravity about 2.65. The rounded shape indicates natural water wear or tumbling.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when microscopic fluid inclusions or structural defects cloud quartz, commonly in hydrothermal veins, pegmatites, and igneous rocks; quartz is widespread from Precambrian to modern environments. This specimen may be a river pebble or tumbled stone.

Uses & applications

Used for countertops, glass, ceramics, abrasives, and electronics; attractive translucent pieces are sold as inexpensive lapidary or specimen material.

Geological facts

Milky quartz is one of the most abundant quartz varieties and can fluoresce weakly in some specimens, depending on impurities. It may resemble white calcite, but quartz is substantially harder.

Field identification & locations

Common worldwide, especially in river gravels and quartz veins; it scratches glass but does not scratch easily with a steel knife. Avoid relying on appearance alone because the image cannot confirm composition.