metamorphic
Tiger Iron
Tiger Iron (A complex combination of Hematite Fe2O3, Red Jasper SiO2, and Tiger's Eye SiO2/FeOOH)
Hardness: 6.5-7 (Mohs scale). Color: Bands of golden yellow, deep red, and metallic silver/grey. Luster: Vitreous to silky and metallic. Crystal structure: Hexagonal/Trigonal (Quartz/Hematite). Specific gravity: 2.64-3.5.
- Hardness
- 6
- Color
- Bands of golden yellow, deep red, and metallic silver/grey
- Luster
- Vitreous to silky and metallic
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Physical properties
Hardness: 6.5-7 (Mohs scale). Color: Bands of golden yellow, deep red, and metallic silver/grey. Luster: Vitreous to silky and metallic. Crystal structure: Hexagonal/Trigonal (Quartz/Hematite). Specific gravity: 2.64-3.5.
Formation & geological history
Formed approximately 2.2 to 2.5 billion years ago (Proterozoic Eon) during metamorphic compression of Precambrian sedimentary band iron formations (BIFs). The alternating layers were subjected to tectonic pressure and silica-rich hydrothermal activity.
Uses & applications
Primarily used in jewelry (cabochons, beads), LAPIDARY arts for carving and sculpture, and as architectural ornamental stone (tiles/tabletops).
Geological facts
Tiger Iron is only found in the Pilbara region of Western Australia and parts of South Africa. It is a 'stromatolite' related formation, potentially containing evidence of the earliest life forms on Earth that oxygenated the planet.
Field identification & locations
Identify in the field by its high density (due to iron content), distinct magnetic properties in the dark bands, and chatoyancy (shimmer) in the yellow bands. Commonly found in large outcrop boulders in the Hamersley Range, Australia.
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