Quartz with Iron Staining

Physical Properties

Hardness: 7 on Mohs scale; Color: Clear to white with brown/orange staining; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes or within pegmatites where silica-rich fluids crystallize. The orange/brown coloring comes from secondary iron oxide staining (limonite or hematite) following the crystal's formation.

Uses & Applications

Quartz is used in glassmaking, electronics (piezoelectric properties), and abrasives. Iron-stained specimens are primarily collected by hobbyists or used for decorative yard stone.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz is often mistaken for gold by novice prospectors due to the metallic-looking brown sheen and host rock association.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. Look for glassy luster on fractured surfaces. Very common in mountainous regions, riverbeds, and weathered outcrops globally.

Identified on: 4/26/2026

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