Where is Tiger Iron found?
Tiger Iron (a banded variety of Jasper, Hematite, and Tiger's Eye)
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Open the appTiger Iron occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Tiger Iron
Pilbara region, Western Australia
The primary and most significant source of high-quality Tiger Iron, particularly from the Hamersley Basin, known for its vast banded iron formations.
South Africa
Some occurrences of similar banded iron formations with tiger's eye components are found, though less prominent than Australian sources.
United States (Michigan, Minnesota)
Banded iron formations are present in the Lake Superior region, but the specific combination and quality to be classified as 'Tiger Iron' are rare.
Collecting tips
- Look for Banded Iron Formations. Tiger Iron is a specific type of BIF. Search geological maps and literature for areas known to have Precambrian banded iron formations.
- Identify Component Minerals. Familiarize yourself with the appearance of hematite (metallic gray, red streak), jasper (red, opaque, microcrystalline quartz), and tiger's eye (golden-brown, chatoyant). Tiger Iron will have all three.
- Observe Chatoyancy. The presence of the silky, moving band of light (chatoyancy) from the tiger's eye component is a key diagnostic feature that distinguishes it from other BIFs.
- Check for Metamorphic Features. While primarily sedimentary in origin, the tiger's eye component and the overall consolidation suggest some degree of metamorphism.
Quick Check
- Color:
- Banded red, metallic gray, and golden-brown/yellow
- Luster:
- Metallic, dull, and silky (chatoyant)
- Streak:
- Reddish-brown (from hematite component)
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