mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

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

Identified April 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous pegmatites. The white color is caused by tiny gas or liquid bubbles trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, as a silica source for electronics, landscaping, and as a collector's specimen or for lapidary work (beads/decorative carvings).

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its appearance from microscopic fluid inclusions that scatter light.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), white color, and lack of cleavage. Found globally, especially in mountain ranges and riverbeds where it erodes from surrounding rock.