Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to iron-stained yellow/brown; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed from cooling silica-rich hydrothermal fluids in veins or pegmatites. This specimen shows surface weathering and iron oxide staining from soil exposure. Quartz can form over various geological ages throughout Earth's history.

Uses & Applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a common gemstone or decorative landscaping stone.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its cloudy appearance from tiny fluid inclusions trapped during crystal growth.

Field Identification & Locations

Identified in the field by its hardness (scratches glass), lack of cleavage, and white-to-yellowish coloring. Extremely common in temperate soil and stream beds.

Identified on: 5/8/2026

Mode: Standard