Where is Tiger's Eye found?
Tiger's Eye (a variety of Chalcedony)
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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 vast deposits are found in banded iron formations.
Australia
Western Australia has notable deposits, often producing material with a slightly different color range.
India
Smaller deposits are found, contributing to the global supply.
Myanmar (Burma)
Known for some occurrences, though less prominent than South Africa.
United States
Limited occurrences in states like California and Arizona.
Collecting tips
- Look for Chatoyancy. The most distinctive feature is its chatoyancy. Rotate the specimen under a light source to observe the moving band of light.
- Examine Color and Pattern. Observe the characteristic golden-yellow to reddish-brown colors and the parallel fibrous bands.
- Check Hardness. Tiger's Eye has a Mohs hardness of 6.5-7, which can be tested with common tools (e.g., it will scratch glass).
- Consider Geological Context. If collecting in the field, look for areas with metamorphic rocks, especially those associated with banded iron formations or serpentinites.
- Safety Precaution: Crocidolite. While Tiger's Eye itself is quartz and generally safe, its formation involves the replacement of crocidolite (a type of asbestos). Unpolished, raw specimens, especially those with visible blue fibers (Hawk's Eye), might contain residual crocidolite. Avoid inhaling dust from cutting or grinding raw material without proper respiratory protection. Polished Tiger's Eye is considered safe as the asbestos fibers are encapsulated by quartz.
Quick Check
- Color:
- Golden-yellow to reddish-brown with iridescent bands.
- Luster:
- Silky to vitreous.
- Streak:
- White.
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