metamorphic
Tiger's Eye (Raw)
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7.0 (Mohs); Color: Golden to red-brown; Luster: Silky to dull (when raw); Crystal Structure: Trigonal/Fibrous; Chatoyancy (cat's eye effect) even in rough state.
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky to dull (when raw)
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Golden to red-brown; Luster: Silky to dull (when raw); Crystal Structure: Trigonal/Fibrous; Chatoyancy (cat's eye effect) even in rough state.
Formation & geological history
Formed through the pseudomorphism of blue crocidolite asbestos fibers by chalcedony quartz. Most deposits date back to the Precambrian era, formed in banded iron formations.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for metaphysical collectors.
Geological facts
Tiger's Eye is a classic example of pseudomorphism, where one mineral is replaced by another while retaining the original mineral's shape. The golden color comes from iron oxides within the fibers.
Field identification & locations
Identified by its golden-brown fibrous bands and silken luster. Commonly found in South Africa, Western Australia, India, and Myanmar. Look for distinct parallel fiber layers that shimmer when rotated.
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