mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Golden yellow to brown with dark bands; Luster: Silky; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.64-2.71

Hardness: 6
Color: Golden yellow to brown with dark bands
Luster: Silky

Identified February 11, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Golden yellow to brown with dark bands; Luster: Silky; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.64-2.71

Formation & geological history

Formed when quartz replaces the fibrous asbestos mineral crocidolite through a process called pseudomorphism. As the quartz replaces the fibers, it retains the fibrous structure, creating chatoyancy. Most deposits are approximately 2 billion years old, located in metamorphic Precambrian formations.

Uses & applications

Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and metaphysical practitioners.

Geological facts

It is a prime example of 'chatoyancy' (the cat's-eye effect). Historically, Roman soldiers wore it for protection in battle. While it starts as blue asbestos (crocidolite), the iron is oxidized to create the golden-brown color, and the fibers are completely encapsulated by silica, making the finished stone safe to handle.

Field identification & locations

Identify in the field by its distinct golden-yellow fibrous banding and the way it reflects light when tilted (chatoyancy). Commonly found in South Africa (Northern Cape), Australia, India, and Thailand. Collectors should look for sharp, distinct banding and heavy weight due to iron content.

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