mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7. Color: Yellow-brown to golden-brown with silky luster. Crystal structure: Hexagonal/Trigonal (fibrous). Cleavage: None. Specific Gravity: 2.64-2.71.

Hardness: 6
Color: Yellow-brown to golden-brown with silky luster

Identified May 16, 2026More mineral →

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Physical properties

Hardness: 6.5-7. Color: Yellow-brown to golden-brown with silky luster. Crystal structure: Hexagonal/Trigonal (fibrous). Cleavage: None. Specific Gravity: 2.64-2.71.

Formation & geological history

Formed when quartz replaces the fibrous mineral crocidolite (blue asbestos) through a process called pseudomorphism, retaining the fibrous shape which creates chatoyancy. Most deposits are Precambrian in age.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collectible stone in lapidary arts.

Geological facts

The unique 'cat's eye' effect is called chatoyancy. When the iron remains unoxidized, it forms a blue variant known as Hawk's Eye. It has been used as a protective amulet since Roman times.

Field identification & locations

Identified by its distinctive golden-brown bands and silky, shimmering light reflection. Commonly found in South Africa, Australia, Burma, and India. Collectors look for high luster and sharp chatoyancy.

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