mineral

Milky 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 July 18, 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 from the cooling of silica-rich hydrothermal fluids in veins or as a late-stage crystallization in igneous pegmatites. It can be found in rocks from virtually any geological age.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and frequently as landscaping gravel or for ornamental stones and jewelry.

Geological facts

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

Field identification & locations

Identify in the field by its white color, inability to be scratched by a steel knife, and lacks cleavage planes. Found globally in mountainous regions, riverbeds, and as veins in metamorphic rocks.