mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal system: Trigonal/Fibrous; Chatoyancy: Strong (cat's eye effect); Specific Gravity: 2.64-2.71

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

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal system: Trigonal/Fibrous; Chatoyancy: Strong (cat's eye effect); Specific Gravity: 2.64-2.71

Formation & geological history

Formed through the pseudomorphous replacement of fibrous crocidolite (asbestos) by silica (quartz), with iron oxide giving it its golden color. Most deposits are Precambrian in age.

Uses & applications

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

Geological facts

The unique 'shimmer' is called chatoyancy. When the quartz replaces the asbestos fibers, it maintains the fibrous structure, resulting in the moving light bands seen as the stone is turned.

Field identification & locations

Identify by its distinct golden-yellow to brown bands and moving silky luster. Major sources include South Africa (Northern Cape), Australia, and Thailand. Tumbled stones like this one are common in rock shops.

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