mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
Hardness: 7 (Mohs scale), Color: Pinkish-orange to rusty red, Luster: Vitreous to dull, Crystal Structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Pinkish-orange to rusty red, Luster: Vitreous to dull, Crystal Structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed via crystallization from silica-rich hydrothermal fluids or magma cooling. The orange/red coloring occurs when groundwater containing dissolved iron oxides (like hematite or limonite) coats the surface or fills micro-fissures in the quartz.
Uses & applications
Commonly used as decorative stones, landscaping material, or for metaphysical purposes. High-purity quartz is used in manufacturing glass and electronics.
Geological facts
This specimen is often mistaken for Rose Quartz, but Rose Quartz's color comes from titanium or manganese throughout the crystal lattice, whereas iron-stained quartz is typically clear/white quartz with a surface-level 'rusty' coating.
Field identification & locations
Identify in the field by its inability to be scratched by steel (hardness 7) and its waxy, translucent appearance under the staining. Found globally in almost every geological environment, particularly in riverbeds and gravel pits.
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