Milky Quartz

Physical Properties

Hardness: 7 (Mohs scale); Color: White to off-white/beige due to iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed from the crystallization of silica-rich hydrothermal solutions in veins or during the cooling of igneous magmas. This specimen appears to be a weathered piece of vein quartz found in various geological environments.

Uses & Applications

Commonly used as a decorative stone in landscaping, as a source of silica for glass manufacturing, and in some construction aggregates. Large milky quartz specimens are also collected by hobbyists.

Geological Facts

Milky quartz gets its white, cloudy appearance from tiny microscopic 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 and steel), white/cloudy appearance, and lack of cleavage. Often found as rounded pebbles in riverbeds or as angular fragments near weathered quartz veins.

Identified on: 4/26/2026

Mode: Standard