mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Yellowish-brown, tan, or rusty orange; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Yellowish-brown, tan, or rusty orange
Luster: Vitreous to waxy

Identified April 5, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Yellowish-brown, tan, or rusty orange; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or pegmatites where silica-rich fluids mix with iron minerals. The yellow-brown color is due to limonite or hematite staining within the crystal lattice or on surface fractures.

Uses & applications

Primarily for mineral collecting and lapidary work (cabochons). Historically used for flint knapping and tools due to its hardness and fracture pattern.

Geological facts

Also known as 'Iron Quartz' or 'Golden Healer Quartz' in metaphysical circles. The coloration is essentially 'rust' trapped inside or on the surface of the quartz mineral.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and the signature yellow-brown staining that does not wash off easily. Common in riverbeds and mountainous terrain globally.