mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to semi-translucent grey with light brownish-orange iron oxide staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Luster: Vitreous to greasy

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids filling fractures in igneous, metamorphic, and sedimentary environments, or during the late-stage cooling of pegmatites. The milky appearance is caused by microscopic fluid inclusions trapped within the crystal lattice during growth.

Uses & applications

Used in glassmaking, electronics, silicon production, landscaping, decorative stone, and popular among mineral collectors and crystal enthusiasts.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Milky quartz gets its opaque white appearance from millions of microscopic bubbles of gas or liquid trapped inside the mineral during its formation.

Field identification & locations

Identified in the field by its hardness (scratches glass, cannot be scratched by a steel nail), lack of cleavage, glassy to greasy luster, and typical milky white color. Frequently found in riverbeds, gravel deposits, quartz veins, and beaches worldwide.