mineral
Tiger's Eye
SiO2 (Silicon Dioxide) with fibrous crocidolite inclusions
Hardness: 7 Mohs; Color: Golden yellow to deep brown/black; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71; Chatoyancy: Distinct silky band of light
- Hardness
- 7 Mohs
- Color
- Golden yellow to deep brown/black
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden yellow to deep brown/black; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71; Chatoyancy: Distinct silky band of light
Formation & geological history
Formed through the pseudomorphous replacement of blue crocidolite asbestos by silica, maintaining the fibrous structure while turning into quartz. Commonly found in metamorphic rocks.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's gemstone due to its chatoyance.
Geological facts
Famous for the 'chatoyant' effect which makes the stone appear to have cat-eye-like bands of light; it is a member of the chalcedony family.
Field identification & locations
Identify by its unique silky banding and golden-brown stripes that shift when moved in light. Found heavily in South Africa and Australia. Collectors should look for high-contrast bands and a smooth polish.
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