mineral

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to cloudy; 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 cloudy
Luster: Vitreous to greasy

Identified March 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich hydrothermal veins or within pegmatites. The milky appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. Can be found in geological environments ranging from Precambrian to recent epochs.

Uses & applications

Used in glassmaking, abrasives, and as a source of silicon for electronics. While low-grade specimens are used in landscaping/construction, high-quality milky quartz is used for carvings and decorative jewelry beads.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically is white because of microscopic bubbles of liquid or gas trapped within the crystal as it formed.

Field identification & locations

Identify in the field by its ability to scratch glass, its milky white opacity, and the absence of cleavage planes. Found globally in mountainous regions, riverbeds, and mining tailings.

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