Milky Quartz with Iron Staining

Physical Properties

Hardness: 7 (Mohs scale); Color: White, gray, and yellow/orange due to iron oxide staining; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed from the cooling of silica-rich hydrothermal fluids in veins or pegmatites. The yellow/orange staining is a secondary process caused by the oxidation of iron-bearing minerals (limonite/hematite) on the surface or along fractures.

Uses & Applications

Common industrial uses include glass making, electronics (piezoelectric properties), and as an abrasive. Polished specimens are used in jewelry and home decor.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz is sometimes colloquially called 'Golden Healer' in metaphysical circles.

Field Identification & Locations

Identify in the field by its hardness (it will easily scratch glass) and its lack of cleavage. Look for the white/opaque 'milky' appearance with rusty orange residues in cracks.

Identified on: 4/17/2026

Mode: Standard