mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to waxy

Identified June 2, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent of igneous and metamorphic rocks. This specific specimen has been water-worn into a smooth pebble shape over thousands of years.

Uses & applications

Used in glassmaking, abrasives, electronics (as oscillators), and frequently as decorative landscaping stone or in tumbled jewelry.

Geological facts

The milky appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. Quartz is one of the most abundant minerals in the Earth's crust.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, rounded surface if found in a river or beach setting. Found globally in almost all geological environments.