Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; 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. It can be found in rocks from the Precambrian to recent geological ages.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, and as decorative stone in landscaping or jewelry.

Geological Facts

Milky quartz gets its white color from tiny bubbles of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz found on Earth's crust.

Field Identification & Locations

Identify in the field by its white color, ability to scratch glass (hardness 7), and lack of cleavage (it breaks in curved, glassy flakes). Commonly found in pegmatites, riverbeds, and as hydrothermal veins.

Identified on: 4/15/2026

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