metamorphic
Tiger's Eye (Jasper-like Chalcedony)
Silicon dioxide (SiO2) - Pseudomorph after Crocidolite
Hardness: 7 Mohs; Color: Golden yellow to brown with chatoyant bands; Luster: Silky; Crystal structure: Trigonal (microcrystalline); Specific Gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden yellow to brown with chatoyant bands
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden yellow to brown with chatoyant bands; Luster: Silky; Crystal structure: Trigonal (microcrystalline); Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism of blue crocidolite (asbestos) by silica. As minerals are replaced, the fibrous structure is preserved, creating the chatoyancy (shimmering effect). Found in metamorphic rocks associated with iron formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for gemstone collectors.
Geological facts
Tiger's Eye is a 'pseudomorph,' meaning one mineral has replaced another while retaining the original mineral's shape and structure. It is considered a protective stone in various cultures and is the traditional gift for a 9th wedding anniversary.
Field identification & locations
Identify by its characteristic 'shimmer' or chatoyancy when tilted in light. It often features alternating layers of yellow and brown. Commonly found in South Africa, Western Australia, and India.
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