mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified March 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or within pegmatites. The white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in rocks of all geological ages.

Uses & applications

Used in glass making, ceramics, as an abrasive, in the electronics industry for its piezoelectric properties, and widely in jewelry or as decorative landscaping stone.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While most crystalline quartz is clear, Milky Quartz serves as an indicator for primary mineral veins, often found alongside gold or silver deposits.

Field identification & locations

Identify by its ability to scratch glass, its milky-white appearance, and lack of cleavage planes. It is commonly found in riverbeds, beaches, and mountain outcrops globally. Collectors look for pieces with interesting inclusions or unique water-worn shapes.