mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale). Color: Opaque white to light cream/pinkish. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: Indistinct/Conchoidal fracture. Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Opaque white to light cream/pinkish
Luster: Vitreous to greasy

Identified June 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

Formed from silica-rich hydrothermal fluids cooling in veins or as a primary mineral in igneous rocks. This specific specimen is water-worn (alluvial), likely having been eroded and smoothed by river or glacial action.

Uses & applications

Used in construction as aggregate, in glassmaking, and as a raw material for silicon chips. Smooth pebbles are common in landscaping and aquarium decor. High-quality quartz can be used for oscillating circuits.

Geological facts

Milky Quartz gets its white color from tiny fluid inclusions of gas or liquid trapped during the crystal's growth. It is one of the most common minerals on the Earth's continental crust.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of clear cleavage, and waxy luster when rounded. Common in river beds, beaches, and gravel pits worldwide. Collectors should look for unique inclusions or iron staining.