metamorphic

Tiger's Eye (Rough / Raw)

Silicified Crocidolite Pseudomorph (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: Golden-brown, amber, brown, and bluish grey. Luster: Silky to vitreous. Crystal system: Trigonal (microcrystalline quartz replacing fibrous amphibole). Cleavage: None (fibrous fracture). Specific gravity: 2.64 - 2.71.

Hardness: 7 on Mohs scale
Color: Golden-brown, amber, brown, and bluish grey
Luster: Silky to vitreous

Identified July 27, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed through a metamorphic pseudomorphosis process where quartz gradually replaces fibrous crocidolite (blue asbestos) while retaining its parallel fibrous structure, creating chatoyancy.

Uses & applications

Widely used in lapidary work for cabochons, beads, carvings, ornamental sculptures, and jewelry, as well as being a popular gemstone for collectors.

Geological facts

The shimmering cat's-eye effect is called chatoyancy. When blue crocidolite is only partially replaced, it forms a mixture of blue (Hawk's Eye) and golden-brown Tiger's Eye as seen in this specimen.

Field identification & locations

Identify in the field by its distinctive parallel fibrous texture, silky reflection, and characteristic golden-brown to blue-grey banded color. Commonly found in South Africa, Western Australia, Namibia, and India.