Milky Quartz Pebble

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to off-white; Luster: Vitreous to waxy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Formation & Geological History

Formed from cooling silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specimen is a water-worn river pebble, likely millions of years old, shaped by fluvial erosion.

Uses & Applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative landscaping stone or pocket stones for collectors.

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 Earth's crust.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, rounded water-worn texture. Commonly found in riverbeds, beaches, and glacial till globally.

Identified on: 4/30/2026

Mode: Standard