mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Hardness: 6.5-7 (Mohs scale); Color: Golden brown to yellow-gold; Luster: Silky to dull (when rough); Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71.

Hardness: 6
Color: Golden brown to yellow-gold
Luster: Silky to dull (when rough)

Identified March 27, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Golden brown to yellow-gold; Luster: Silky to dull (when rough); Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71.

Formation & geological history

Formed through the pseudomorphism of blue crocidolite asbestos by silica (quartz). Iron oxides cause the golden coloration. Commonly found in Proterozoic rock formations roughly 2.5 billion years old.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal healing and mineral collecting.

Geological facts

It exhibits 'chatoyancy', a cat-eye effect caused by the reflection of light off the parallel mineral fibers. If the iron is preserved in its original state without oxidation, it becomes the blue variety known as Hawk's Eye.

Field identification & locations

Identify by its distinct golden-yellow bands and silky luster when tilted in light. Primarily sourced from South Africa (Griqualand West) and Western Australia. Collectors look for strong chatoyancy and lack of matrix rock.

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