mineral

Milky Quartz with Inclusions

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent with grey/green inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent with grey/green inclusions
Luster: Vitreous to waxy

Identified May 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal solutions or magmatic cooling. Milky quartz often contains microscopic fluid inclusions of gas or liquid trapped during crystal growth. These specimens are ubiquitous across many geological ages.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as a landscape stone or minor gemstone/collector specimen.

Geological facts

Milky quartz is the most common variety of crystalline quartz. The white color is caused by minute fluid inclusions of gas and/or liquid trapped during crystal formation, which scatter light.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and waxy luster. Common in riverbeds, beaches, and vein deposits globally. In this specimen, darker patches may be chlorite or mica inclusions.