mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Conchoidal fracture, no true cleavage; Specific Gravity: 2.65

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

Identified May 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, pegmatites, and through the cooling of silica-rich magma or hot fluids. As the crystal grows rapidly, microscopic fluid inclusions become trapped, giving it a cloudy, milky appearance. Common throughout all geological eras.

Uses & applications

Used in glassmaking, abrasives, and as a component in concrete and mortar. Higher quality samples are used in costume jewelry, lapidary work, and crystal healing collections.

Geological facts

Milky quartz is one of the most common mineral varieties on Earth. The 'milkiness' is caused by tiny bubbles of gas or liquid trapped during the crystal's formation.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), its white color, and its lack of cleavage. Often found in riverbeds, mountains, and as 'white veins' in other rock formations. Very common worldwide.