mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent, with a vitreous-to-waxy luster and no cleavage; it has a trigonal crystal structure, though this rounded specimen is likely tumbled or naturally worn. The surface shows minor dark inclusions or staining and fractures.

Identified September 9, 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

Milky quartz forms when microscopic fluid inclusions, fractures, or impurities cloud quartz in igneous, metamorphic, and hydrothermal settings. Quartz is geologically ancient and widespread; the specimen’s exact age and source cannot be determined visually.

Uses & applications

Used in glassmaking, electronics, abrasives, engineered stone, and as an inexpensive lapidary or decorative material.

Geological facts

Quartz is one of Earth’s most abundant minerals and ranks 7 on the Mohs scale, hard enough to scratch ordinary glass.

Field identification & locations

Identify it by its hardness, glassy appearance, lack of cleavage, and white translucence; common sources include quartz veins, granitic rocks, pegmatites, and river gravels. A streak test should be white, and a steel knife should not scratch it.