mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs), Color: Opaque white to translucent white, Luster: Vitreous (glassy) to greasy, Crystal System: Trigonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs), Color: Opaque white to translucent white, Luster: Vitreous (glassy) to greasy, Crystal System: Trigonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins, pegmatites, and through various geological processes. Its white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in rocks from nearly all geological periods.

Uses & applications

Used in jewelry as tumbled stones and beads, in glassmaking, as a source of silicon for electronics, and in landscaping or construction filler.

Geological facts

Milky quartz is one of the most common varieties of crystalline quartz on Earth. The bubbles causing the milky appearance can be microscopic, and the mineral is often the last to crystallize in hydrothermal veins.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, white color, and glassy luster. It is found globally across all continents in mountainous and igneous terrains.