metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs); Color: Golden yellow to silky brown; Luster: Silky/Vitreous; Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Chatoyancy (cat's eye effect).
- Hardness
- 6
- Color
- Golden yellow to silky brown
- Luster
- Silky/Vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden yellow to silky brown; Luster: Silky/Vitreous; Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Chatoyancy (cat's eye effect).
Formation & geological history
Formed through the replacement of fibrous blue crocidolite asbestos by silica (quartz). It is a pseudomorph process where the mineral maintains the fibrous structure while changing composition. Common in iron-rich metamorphic rocks.
Uses & applications
Predominantly used for lapidary purposes including jewelry, cabochons, beads, and carved decorative objects like the polished point shown. Also used in ornamental construction and metaphysical collecting.
Geological facts
The unique shimmer, known as chatoyancy, occurs because the fibrous structure reflects light like a spool of silk. While it originates from asbestos, the silicate replacement process makes it stable and safe to handle.
Field identification & locations
Identify in the field by its distinct golden-brown banded appearance and the way light seems to move across the surface (chatoyancy). Common sources include South Africa (Griatland West), Western Australia, India, and Myanmar.
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