mineral

Tiger's Eye

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

Hardness: 6.5–7 (Mohs); Color: Golden brown to brownish yellow; Luster: Silky to chatoyant; Crystal Structure: Trigonal (fibrous texture); Specific Gravity: 2.64–2.71

Hardness: 6
Color: Golden brown to brownish yellow
Luster: Silky to chatoyant

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 6.5–7 (Mohs); Color: Golden brown to brownish yellow; Luster: Silky to chatoyant; Crystal Structure: Trigonal (fibrous texture); Specific Gravity: 2.64–2.71

Formation & geological history

Formed through a process called pseudomorphism, where silica (quartz) replaces the fibrous mineral crocidolite (blue asbestos) while retaining its original fibrous structure. Most deposits are sourced from metamorphic iron formations.

Uses & applications

Used extensively in jewelry as cabochons, beads, and carvings. Also used as an ornamental stone in home decor and by collectors for its chatoyant properties.

Geological facts

The characteristic 'cat's eye' effect is called chatoyancy. When the quartz replacement is incomplete, it remains blue and is called Hawk's Eye. It is the anniversary gemstone for the 9th year of marriage.

Field identification & locations

Identified by its distinctive golden-brown bands and silky luster that reflects light in a wave-like motion when rotated. Commonly found in South Africa (Northern Cape), Western Australia, India, and Myanmar.

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