metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5–7 on the Mohs scale; Color: Golden-yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Cleavage: None; Specific gravity: 2.64–2.71.

Hardness: 6
Color: Golden-yellow to deep brown
Luster: Silky

Identified March 30, 2026More metamorphic →

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Physical properties

Hardness: 6.5–7 on the Mohs scale; Color: Golden-yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Cleavage: None; Specific gravity: 2.64–2.71.

Formation & geological history

Formed through a metamorphic process where quartz replaced the blue asbestos mineral crocidolite through pseudomorphism. Iron oxides (limonite) provide the characteristic gold/brown color. Primarily found in Precambrian rock formations over 2 billion years old.

Uses & applications

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

Geological facts

Tiger's Eye exhibits a unique optical property called chatoyancy, or the 'cat-eye effect.' When turned in light, the fibers create a shimmering band of light that seems to glide across the surface. It was once considered more valuable than gold in the early 19th century.

Field identification & locations

Identify in the field by its distinct golden-brown fibrous bands and high silky luster when polished. It is mostly found in South Africa (Griqualand West), but also occurs in Western Australia, India, and Namibia.