Quartz with Iron Oxide Inclusions

Physical Properties

Hardness: 7 (Mohs scale). Color: Clear/white quartz heavily stained with rusty orange/red iron oxide. Luster: Vitreous on quartz, earthy on oxide coating. Crystal structure: Hexagonal (quartz). Cleavage: None (conchoidal fracture).

Formation & Geological History

Forms in hydrothermal veins, pegmatites, or diverse geological environments where silica-rich fluids permeate. The orange/red coloring comes from subsequent exposure to iron-rich fluids or weathering processes depositing iron oxide (rust) onto or into the quartz.

Uses & Applications

Often collected by hobbyists. Has no major industrial use in this impure form, though massive pure quartz is used in glass and electronics.

Geological Facts

The reddish-orange staining is very common in surface-collected quartz and is often referred to as 'ferruginous quartz'.

Field Identification & Locations

Identifiable by its glassy luster, ability to scratch glass, and the distinct rusty-orange earthy coating. Found globally in areas with quartz veins and iron-rich soils.

Identified on: 4/26/2026

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