mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 Mohs; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 Mohs
Color: White to opaque
Luster: Vitreous to greasy

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Forms through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent of igneous and metamorphic rocks. Often found in pegmatites and gold-bearing quartz veins.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), landscaping, and as a semi-precious gemstone for decorative carvings and jewelry.

Geological facts

The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's formation. It is one of the most abundant minerals on Earth's crust.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and white opaque color. Found globally in riverbeds, mountains, and beaches. Look for conchoidal (shell-like) fractures.