metamorphic
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 6.5-7. Color: Golden to reddish-brown with chatoyant bands. Luster: Silky. Crystal system: Trigonal (fibrous structure). Cleavage: None. Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden to reddish-brown with chatoyant bands
- Luster
- Silky
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Physical properties
Hardness: 6.5-7. Color: Golden to reddish-brown with chatoyant bands. Luster: Silky. Crystal system: Trigonal (fibrous structure). Cleavage: None. Specific Gravity: 2.64-2.71.
Formation & geological history
Formed when quartz replaces fibrous crocidolite (blue asbestos) through a process called pseudomorphism. As it replaces the fibers, iron dissolves and colors the quartz gold and brown. Most deposits are Precambrian, over 2 billion years old.
Uses & applications
Popular in jewelry, lapidary arts (cabochons, beads), decorative carvings, and as a pocket stone for collectors. It is also used in high-end inlay work.
Geological facts
Tiger's Eye is a 'pseudomorph', meaning it has the shape of one mineral (crocidolite) but the chemical composition of another (quartz). It exhibits a unique optical effect known as chatoyancy, or the 'cat-eye' effect.
Field identification & locations
Identify by its distinct golden-yellow and brown parallel bands and its silky luster. It is commonly found in South Africa (Griqualad West), Australia, India, and Myanmar. In the field, look for heavy, banded metamorphic rocks in iron-rich geological regions.
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