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, granular texture; Mohs hardness 7, no cleavage, uneven conchoidal fracture, and specific gravity about 2.65. The specimen appears rounded and weathered, likely naturally tumbled or lightly polished.

Identified August 29, 2026More mineral →

Explore Milky quartz pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; its cloudy appearance commonly results from microscopic fluid inclusions or fractures. Quartz is widespread in rocks of nearly all geological ages.

Uses & applications

Used in glassmaking, ceramics, abrasives, electronics, engineered stone, and occasionally inexpensive cabochons or decorative pieces.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Identify it by its hardness—scratching ordinary glass—lack of cleavage, pale color, and glassy fracture; it commonly occurs in stream gravels, quartz veins, and weathered granite or pegmatite. Exact identification is less certain from the image alone.