mineral

Milky Quartz

Quartz (SiO2)

Hardness: 7 on Mohs scale; Color: milky white to light tan; Luster: vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: milky white to light tan
Luster: vitreous (glassy) to waxy

Identified January 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: milky white to light tan; Luster: vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Forms through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent of igneous and metamorphic rocks. The milky appearance is caused by microscopic inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, construction as aggregate, abrasives, electronics (due to piezoelectric properties), and as a gemstone or decorative stone in landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often associated with gold deposits in 'mother lode' veins, making it a key indicator for historic prospectors.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent white appearance. It is found globally, particularly in mountain ranges and riverbeds where it resists weathering.