Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale. Color: White to translucent waxy white. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: Indistinct/Conchoidal fracture. Specific gravity: 2.65.

Formation & Geological History

Formed through the crystallization of silica-rich hydrothermal solutions or magmatic cooling. Found in igneous, metamorphic, and sedimentary environments globally. This specimen likely came from a hydrothermal vein.

Uses & Applications

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

Geological Facts

Milky quartz gets its white color from tiny microscopic fluid inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field Identification & Locations

Identify in the field by its ability to scratch glass, its lack of cleavage (it breaks in irregular curves), and its characteristic milky appearance. Found frequently in riverbeds and mountainous terrain.

Identified on: 4/21/2026

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