mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to cream
Luster: Vitreous to greasy

Identified May 14, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins or as a constituent of igneous rocks like granite. The cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative masonry or garden stone. Low-grade specimens are common for landscape architecture.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can be found in almost every geological environment and is often the primary component of river pebbles.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and white opaque color. It is nearly ubiquitous worldwide and is a primary indicator of hydrothermal activity or granitic basement rocks.