metamorphic
Tiger's Eye (with Hematite/Magnetite matrix)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH/Fe2O3)
Hardness: 7 Mohs; Color: Golden-brown to yellow with dark gray/black metallic layers; Luster: Silky (fibrous) to metallic; Crystal structure: Trigonal/Fibrous; Specific gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden-brown to yellow with dark gray/black metallic layers
- Luster
- Silky (fibrous) to metallic
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Physical properties
Hardness: 7 Mohs; Color: Golden-brown to yellow with dark gray/black metallic layers; Luster: Silky (fibrous) to metallic; Crystal structure: Trigonal/Fibrous; Specific gravity: 2.64-2.71
Formation & geological history
Formed through the hydrothermal alteration of crocidolite (blue asbestos) into quartz, a process called pseudomorphism. The golden color comes from iron oxides. Often associated with Precambrian banded iron formations.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular collector's mineral specimen.
Geological facts
Tiger's eye exhibits a unique optical effect known as chatoyancy or the 'cat's eye' effect. This specific specimen shows the 'iron tiger eye' variety where the golden quartz is layered with dark iron ore.
Field identification & locations
Identify by its silky, fibrous golden bands that shimmer when moved under light (chatoyancy) and its proximity to heavy metallic layers. Commonly found in Griqualand West, South Africa and the Pilbara region of Australia.
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