Where is Tiger Iron found?
Tiger Iron (a 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 Craton, Western Australia
The primary and most significant source of high-quality Tiger Iron. The banded iron formations here are among the oldest on Earth, dating back to the Archean Eon.
South Africa
Another notable source, particularly in the Northern Cape Province, where extensive banded iron formations occur.
United States (Michigan, Minnesota)
While not typically producing the same quality or quantity of ornamental Tiger Iron, banded iron formations exist in the Lake Superior region, which can contain similar mineral assemblages, though often lacking the distinct tiger's eye component.
Collecting tips
- Geological Context. Look for areas known for ancient banded iron formations (BIFs), particularly those that have experienced low-grade metamorphism and metasomatic alteration.
- Visual Identification. Search for rocks exhibiting distinct, parallel bands of golden-brown, metallic gray/black, and red/brown. The chatoyancy of the tiger's eye component is a key indicator.
- Associated Minerals. Tiger Iron will be found in association with other iron-rich minerals, chert, and sometimes other metamorphic minerals depending on the specific BIF and metamorphic grade.
- Safety Precautions. When collecting in the field, be aware of potential hazards associated with old mining sites or rugged terrain. Always wear appropriate safety gear, including eye protection and sturdy footwear. While Tiger Iron itself is not acutely hazardous, some associated minerals in BIFs (like crocidolite asbestos, the precursor to tiger's eye) can be dangerous if disturbed or inhaled. However, in Tiger Iron, the crocidolite has been fully replaced by quartz, rendering it safe.
Quick Check
- Color:
- Banded golden-brown, metallic gray/black, red/brown
- Luster:
- Mixed: silky/chatoyant, submetallic/metallic, dull/vitreous
- Streak:
- Reddish-brown (from hematite component)
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