Milky Quartz with Iron Staining

Physical Properties

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

Formation & Geological History

Formed through hydrothermal processes or igneous crystallization in pegmatites and veins. The fractures and brown staining are caused by secondary iron oxide infiltration (limonite/hematite) after the quartz formed.

Uses & Applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as a common gemstone/collectible.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this one, showing a 'lattice' of iron staining, are often found in areas with high mineral weathering.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and characteristic waxy or glassy appearance. It is ubiquitous in mountainous and riverbed environments.

Identified on: 4/14/2026

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