mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7.0 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71.

Hardness: 6
Color: Golden to red-brown
Luster: Silky

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71.

Formation & geological history

Formed through a process of pseudomorphism where quartz replaces crocidolite asbestos fibers. Most deposits are found in Precambrian banded iron formations, typically dated to roughly 2.5 billion years ago.

Uses & applications

Primarily used in jewelry (cabochons), ornamental carvings, beads, and as a popular lucky stone for collectors.

Geological facts

It exhibits chatoyancy, the 'cat-eye' effect, caused by the reflection of light off parallel fibers within the stone. If the quartz replaces fibers without them being oxidised into limonite, 'Hawk's Eye' (blue) is formed instead.

Field identification & locations

Identify by its characteristic silk-like golden bands and chatoyant light reflection when rotated. Found commonly in South Africa, Australia, Burma, and India. It is a staple for beginner lapidary hobbyists.

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