Milky Quartz

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.

Identified on: 4/25/2026

Mode: Standard