Where is Tiger's Eye found?
Quartz (fibrous chalcedony with crocidolite inclusions)
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Open the appTiger's Eye 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's Eye
South Africa
The primary and most significant source, particularly in the Griqualand West region, where it occurs in extensive banded iron formations.
Australia
Found in Western Australia, producing good quality material.
India
Known for some occurrences, though less prominent than South Africa.
Myanmar (Burma)
Reported occurrences.
United States
Limited occurrences in states like Arizona and California.
Collecting tips
- Look for Banded Iron Formations. Tiger's Eye is typically found within or adjacent to banded iron formations (BIFs), which are ancient sedimentary rocks rich in iron oxides and chert. These formations are key indicators.
- Identify Crocidolite. In its unoxidized state, the precursor mineral crocidolite (blue asbestos) can be found. While Tiger's Eye itself is quartz, understanding the geological context of crocidolite formation is crucial.
- Observe Chatoyancy. The most distinctive feature is its chatoyancy. Look for a silky, moving band of light on polished or fractured surfaces. This optical effect is unmistakable.
- Check for Color and Luster. The characteristic golden-brown to reddish-brown colors and silky luster are strong indicators. Blue-gray varieties (Hawk's Eye) also exhibit chatoyancy.
- Safety Precautions (Crocidolite). WARNING: While Tiger's Eye itself is quartz and generally safe, its formation involves the replacement of crocidolite, a hazardous form of asbestos. When collecting in areas known for Tiger's Eye, especially if unweathered or partially replaced material is present, there is a risk of encountering crocidolite. Crocidolite fibers are extremely fine and can become airborne, posing a severe health risk if inhaled (mesothelioma, asbestosis, lung cancer). Always wear appropriate respiratory protection (P100 or N100 respirator), eye protection, and gloves when handling raw, unpolished material, especially if it appears fibrous or blue-gray. Avoid breaking or disturbing fibrous blue material. Do not saw, grind, or sand raw material without proper ventilation and personal protective equipment. Polished Tiger's Eye is generally considered safe as the asbestos fibers are encapsulated within the quartz matrix.
Quick Check
- Color:
- Golden-brown to reddish-brown (or blue-gray for Hawk's Eye)
- Luster:
- Silky, chatoyant
- Streak:
- White
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