mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Identified June 28, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or pegmatites from silica-rich fluids cooling under deep geological pressure, often associated with metamorphic and igneous terrains.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscape stone or building material.

Geological facts

Milky quartz gets its cloudy appearance from tiny fluid or gas inclusions trapped during crystal growth. It is one of the most common minerals in the Earth's crust.

Field identification & locations

Identify in the field by its ability to scratch glass and lack of cleavage. It is found globally in riverbeds, mountains, and mines. Look for the characteristic 'greasy' luster on broken surfaces.