mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. It occurs in all geological ages from Precambrian to recent and is one of the most common crustal minerals.

Uses & applications

Used in glass making, abrasive manufacturing, as a source of silicon for electronics, and in decorative landscaping or jewelry (mostly as tumbled stones).

Geological facts

The white color is caused by tiny inclusions of gas or liquid trapped during the crystal's formation. It is the most common variety of crystalline quartz found on Earth's surface.

Field identification & locations

Identify by its hardness (scratches glass), white color, and lack of cleavage. Often found in riverbeds or near mountain outcrops. Essential for novice collectors due to its abundance and distinct physical properties.