Mineral (Metamorphic pseudomorph)
Tiger's Eye (Rough)
Silicon Dioxide (SiO2) with fibrous crocidolite / Limonite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Golden brown to brownish-yellow, Luster: Silky/Vitreous, Crystal structure: Trigonal (fibrous texture), Cleavage: None, Specific Gravity: 2.64-2.71
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Golden brown to brownish-yellow, Luster: Silky/Vitreous, Crystal structure: Trigonal (fibrous texture), Cleavage: None, Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism of crocidolite (asbestos) fibers by silica (quartz). Iron within the structures oxidizes to limonite, giving it the golden hue. Most deposits are Proterozoic in age (approx. 2 billion years old).
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular semi-precious stone for collectors due to its chatoyancy.
Geological facts
It is a ‘pseudomorph,’ meaning it formed when one mineral replaced another while retaining the original shape. When cut and polished, it exhibits chatoyancy, the 'cat-eye' effect where a band of light moves across the stone.
Field identification & locations
Identify in the field by its distinct fibrous, parallel bands of gold and dark brown and its silky sheen even in rough form. Found predominantly in South Africa (Griqualand West), Western Australia, and parts of India and Brazil.
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Other mineral (metamorphic pseudomorph) specimens
Tiger's Eye
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Mineral (Metamorphic pseudomorph)
Tiger's Eye (Polished Point/Tower)
SiO2 (Silicon Dioxide) with included crocidolite fibers
Mineral (Metamorphic pseudomorph)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz (SiO2) after Crocidolite
mineral