Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: White to translucent pinkish-tan; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids cooling in veins and pegmatites, often found in igneous environments or as a secondary mineral in metamorphic rocks. This specimen appears to be water-worn, likely from a stream bed.

Uses & Applications

Used as a source of silica for glassmaking, as an abrasive, and in construction. Larger milky quartz boulders are used for landscaping. While less valuable than clear crystal, it is collected for its aesthetic and 'lucky' associations.

Geological Facts

Milky quartz gets its cloudy appearance from minute fluid inclusions of gas and/or liquid trapped during crystal growth. It is one of the most common minerals on Earth's crust.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and waxy luster. Common in stream beds, hillsides, and as decorative stone. Look for 'bull quartz' veins in exposed bedrock.

Identified on: 4/28/2026

Mode: Standard