mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, with a vitreous-to-waxy luster and massive or cryptocrystalline structure; it has no cleavage and conchoidal fracture. The rounded shape suggests natural water wear or tumbling, though the surface may also be frosted or polished.

Identified August 13, 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

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and is extremely common in veins and crystalline rocks. Individual quartz grains and pebbles can be billions of years old, while the rounded specimen’s current form developed through later erosion.

Uses & applications

Used in glassmaking, ceramics, electronics, abrasives, and engineered stone; attractive pieces are used for display and inexpensive jewelry.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its glassy translucence, lack of cleavage, conchoidal breakage, and ability to scratch ordinary glass; a steel nail should not scratch it. Common in stream gravels and quartz veins worldwide.