mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal (often hexagonal prisms in well-formed crystals); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque
Luster: Vitreous to greasy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or within igneous pegmatites. The white 'milky' appearance is caused by microscopic inclusions of gas or liquid trapped during the crystal's growth over millions of years.

Uses & applications

Major source of silicon for electronics and glassmaking; used as an abrasive, in construction as aggregate, and in landscaping or as affordable decorative stones and jewelry beads.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz. It was historically used by various cultures to create stone tools when flint was unavailable.

Field identification & locations

Identify in the field by its white color, ability to scratch glass (hardness 7), and lack of cleavage (it breaks with curved, glass-like surfaces). Commonly found in vein deposits and as rounded river pebbles. Look for it in mountainous regions or areas with exposed granite.