mineral

Ferruginous Quartz

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

Hardness: 7 (Mohs scale), Color: Yellow to rusty orange/brown due to iron staining, Luster: Vitreous to dull, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified April 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as a secondary mineral in sedimentary environments. The orange/yellow coloration is caused by iron-rich fluids (limonite or hematite) permeating the quartz during or after formation.

Uses & applications

Commonly used as a decorative landscape stone, for lapidary work (tumbling), and as a metaphysical healing crystal ('Golden Healer' in some circles).

Geological facts

The yellow-orange staining is often only on the surface or in micro-fractures; if soaked in an oxalic acid bath, the iron will dissolve, revealing the white or clear quartz underneath.

Field identification & locations

Identify in the field by its high hardness (it will scratch glass) and its 'rusty' appearance. It is often found in areas with high iron content in the soil or bedrock.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

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Mineral/Rock

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