mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: White to milky translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: White to milky translucent
Luster: Vitreous to greasy

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to milky translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Forms from the cooling of silica-rich hydrothermal fluids in veins or as a major constituent of igneous pegmatites. It is one of the most common minerals on Earth, found throughout nearly all geological ages.

Uses & applications

Used as a source of silica for glassmaking, in construction as aggregate, in electronics for its piezoelectric properties, and by collectors as decorative specimens.

Geological facts

The milky white color is caused by tiny inclusions of gas and/or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its hardness (will scratch glass), white color, and lack of cleavage. It is found globally, particularly in mountainous regions and riverbeds as eroded cobbles.