mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs), Color: Milky white to cloudy, Luster: Vitreous to greasy, Crystal structure: Hexagonal (Trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65

Identified July 10, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs), Color: Milky white to cloudy, Luster: Vitreous to greasy, Crystal structure: Hexagonal (Trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65

Formation & geological history

Forms in hydrothermal veins or as a major constituent in igneous and metamorphic rocks. The cloudy appearance is caused by tiny liquid or gas bubble inclusions trapped during crystal growth.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, as a gemstone in tumbled form, and for decorative landscaping.

Geological facts

Milky quartz is one of the most common varieties of crystalline quartz on Earth. Its white color is specifically due to microscopic inclusions of water or gas being trapped inside the structure millions of years ago.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and common occurrence as vein filler. It is ubiquitous in mountainous regions and riverbeds worldwide.