mineral

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions

AI-generated identification · may be incorrect

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.

Identified August 4, 2026More mineral →

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Physical properties

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.