mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Hardness: 7 (Mohs scale), Color: Rusty brown, orange, and translucent white, Luster: Vitreous to dull, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified May 14, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Rusty brown, orange, and translucent white, Luster: Vitreous to dull, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes or igneous crystallization. The reddish-brown staining occurs when iron-rich water penetrates fractures in the quartz, depositing iron oxides like hematite or limonite over geological time.

Uses & applications

Primarily used as decorative specimens for collectors, in lapidary work for cabochons, and as a component in aggregate for construction when found in large quantities.

Geological facts

Iron-stained quartz is a common indicator in gold prospecting, as hydrothermal fluids often carry both silica and gold alongside iron minerals. The coating can sometimes be removed using oxalic acid to reveal the clear crystal underneath.

Field identification & locations

Identify in the field by its hardness (will scratch glass), translucent areas showing through the rust, and lack of cleavage. Commonly found in riverbeds, mountain scree, and mining tailings.

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