mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions
Hardness of 7 on the Mohs scale, vitreous to greasy luster, hexagonal crystal system, uneven to conchoidal fracture, white streak, specific gravity of 2.65, showing yellow, orange, and reddish-brown coloration due to iron staining.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, hexagonal crystal system, uneven to conchoidal fracture, white streak, specific gravity of 2.65, showing yellow, orange, and reddish-brown coloration due to iron staining.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and sedimentary environments where silica-rich fluids deposit quartz crystals in cavities, with iron-bearing solutions staining or coating the crystal.
Uses & applications
Used in mineral collecting, ornamental displays, lapidary arts, and sometimes faceted for jewelry.
Geological facts
Quartz is one of the most abundant minerals on Earth. When iron oxide (like hematite or goethite) is present within or on the crystal, it creates warm sunset hues commonly referred to as tangerine or ferruginous quartz.
Field identification & locations
Identified by its crystal habit, hardness of 7 (scratches glass), conchoidal fracture, and characteristic iron-staining colors ranging from yellow to deep red. Found worldwide in quartz-bearing rock formations.
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