mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, milky, or cloud-like; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White, milky, or cloud-like
Luster: Vitreous to greasy

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, milky, or cloud-like; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Formation & geological history

Forms in hydrothermal veins, pegmatites, and igneous rocks through the cooling of silica-rich fluids. It is found in diverse geological environments across all ages.

Uses & applications

Used in glassmaking, abrasives, silicon production, and as an ornamental stone in landscaping or low-cost jewelry (beads/cabochons).

Geological facts

The milky white color is caused by tiny inclusions of liquid or gas trapped during the crystal's growth. It is one of the most abundant minerals on Earth's surface.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic milky-white opacity. Commonly found in gravel, riverbeds, and mountainous regions.