Mineral

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown with silky luster; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64–2.71.

Hardness: 6
Color: Golden to red-brown with silky luster

Identified April 13, 2026More mineral →

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Physical properties

Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown with silky luster; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64–2.71.

Formation & geological history

Formed as a pseudomorph. It starts as fibrous blue crocidolite (asbestos) which is gradually replaced by silica (quartz) while retaining the fibrous shape, a process known as chatoyancy. Most deposits are Proterozoic in age.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's mineral. Occasionally used for small ornamental inlay.

Geological facts

The 'shimmering' effect is called chatoyancy. Historically, it was worn as a protective amulet against curses and ill-wishing. It is the anniversary gemstone for the 9th year of marriage.

Field identification & locations

Identify in the field by its distinct golden-yellow bands that shift in light (chatoyancy) and its fibrous appearance. Major deposits are found in South Africa, Western Australia, USA, and India.

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