Rock Identifier
Tiger's Eye (SiO2 (Quartz pseudomorph after crocidolite)) — gemstone
gemstone

Tiger's Eye

SiO2 (Quartz pseudomorph after crocidolite)

AI-generated identification · may be incorrect

Hardness of 7 on the Mohs scale, golden-brown to yellow-brown color with a silky luster, and a microcrystalline fibrous quartz structure.

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Physical properties

Hardness of 7 on the Mohs scale, golden-brown to yellow-brown color with a silky luster, and a microcrystalline fibrous quartz structure.

Formation & geological history

Formed when quartz gradually replaces the fibrous mineral crocidolite, typically occurring in metamorphic environments with iron-rich solutions.

Uses & applications

Widely used in jewelry, cabochons, decorative carvings, and as a popular collectible gemstone.

Geological facts

Tiger's eye exhibits a distinct chatoyancy or cat's-eye effect due to parallel fibrous inclusions. It is mined primarily in South Africa and Western Australia.

Field identification & locations

Easily identified by its golden-brown stripes and dynamic light reflection when moved. Collectors can find polished specimens globally in lapidary shops.