mineral

Red Tiger's Eye

SiO2 (Silicon Dioxide with iron inclusions)

Hardness: 7 Mohs; Color: Brownish-red to deep red with chatoyancy; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Specific Gravity: 2.64-2.71

Hardness: 7 Mohs
Color: Brownish-red to deep red with chatoyancy
Luster: Silky

Identified April 6, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Brownish-red to deep red with chatoyancy; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Specific Gravity: 2.64-2.71

Formation & geological history

Formed through the pseudomorphism of crocidolite fibers by quartz. The red color is typically a result of heating (natural or artificial) which oxidizes the iron content (limonite) into hematite.

Uses & applications

Predominantly used for lapidary purposes including jewelry (cabochons, beads), decorative carvings, and as a popular specimen for metaphysical collectors.

Geological facts

Also known as Bull's Eye. It exhibits a unique optical effect called chatoyancy, which creates a shimmering 'cat's eye' band that moves across the stone as it is rotated in light.

Field identification & locations

Identify by the distinctive silky luster and moving bands of light (chatoyancy). It is often found in banded iron formations. Key locations include South Africa, Australia, and Brazil.

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