mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable for Chatoyancy.

Hardness: 6
Color: Golden to red-brown
Luster: Silky

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable for Chatoyancy.

Formation & geological history

Formed through the pseudomorphosis of quartz after the fibrous mineral crocidolite (blue asbestos). The quartz replaces the fibers while maintaining the original fibrous structure. Most deposits are found within Proterozoic formations.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock and mineral collectors.

Geological facts

The optical effect 'chatoyancy' is often called the 'cat-eye effect.' While it looks like asbestos fibers, it is safe to handle because the fibers have been completely encased in quartz.

Field identification & locations

Identify by rotating under light to see the characteristic moving bands of golden-yellow and brown. Commonly found in South Africa, Australia, Burma, and India. Collectors should look for distinct, vibrant banding.

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