mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to grayish-white, translucent to opaque; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to grayish-white, translucent to opaque
Luster: Vitreous (glassy) to greasy

Identified July 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins or as a primary constituent of igneous rocks like granite. The milky white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. They can form at various geological ages.

Uses & applications

Used in glass manufacturing, as an abrasive, in electronics for its piezoelectric properties (if clear enough), and as crushed stone for landscaping/construction. Also popular among mineral collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in gold-bearing veins, making it a classic 'indicator' mineral for prospectors.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife) and lack of cleavage. It is found worldwide, especially in mountainous regions or creek beds.