metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
Hardness: 6.5-7 (Mohs). Color: Golden yellow to silky brown. Luster: Silky. Crystal Structure: Trigonal (fibrous). Cleavage: None. Specific Gravity: 2.64-2.71. Displays chatoyancy (the 'cat's eye' effect).
- Hardness
- 6
- Color
- Golden yellow to silky brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Golden yellow to silky brown. Luster: Silky. Crystal Structure: Trigonal (fibrous). Cleavage: None. Specific Gravity: 2.64-2.71. Displays chatoyancy (the 'cat's eye' effect).
Formation & geological history
Formed through a pseudomorphic process where silica (quartz) replaces the fibrous mineral crocidolite (asbestos) while maintaining its shape. Large deposits date back to the Precambrian period.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular gemstone for crystal collecting and metaphysical purposes.
Geological facts
It is a 'pseudomorph,' meaning 'false form.' It originally began as blue asbestos, but the iron within the mineral oxidized into limonite, giving it the characteristic gold-brown color.
Field identification & locations
Identify by its distinct golden-brown bands and chatoyant shimmer when moved under light. Primarily found in South Africa (Griqualad West), Australia, Myanmar, and India. Collectors value samples with uniform, bright chatoyancy.
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