metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden yellow to deep brown; Luster: Silky/Vitreous; Crystal Structure: Trigonal (as quartz); Cleavage: None; Chatoyancy (cat's eye effect).
- Hardness
- 7 Mohs
- Color
- Golden yellow to deep brown
- Luster
- Silky/Vitreous
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Physical properties
Hardness: 7 Mohs; Color: Golden yellow to deep brown; Luster: Silky/Vitreous; Crystal Structure: Trigonal (as quartz); Cleavage: None; Chatoyancy (cat's eye effect).
Formation & geological history
Formed through a pseudomorphic process where silica (quartz) replaces the fibrous mineral crocidolite (blue asbestos). It is primarily found in metamorphic iron formations, often dating back billions of years to the Precambrian era.
Uses & applications
Mainly used in jewelry (cabochons, beads), decorative carvings, and as a popular lucky stone or protection amulet in metaphysical collecting.
Geological facts
Tiger's Eye is a 'pseudomorph,' meaning its internal structure is quartz but it retains the fibrous external shape of the asbestos minerals it replaced. If the quartz replacement is incomplete, it may appear blue, known as Hawk's Eye.
Field identification & locations
Identify by the unique chatoyant bands of light that move as the stone is rotated under light. Common locations include South Africa (Griequatown), Western Australia, India, and Namibia.
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