mineral
Tumbled tiger’s eye
Tiger’s eye (chatoyant quartz), SiO₂, typically pseudomorphic quartz after crocidolite
AI-generated identification · may be incorrectMohs hardness 6.5–7; golden-brown to dark brown silky bands, vitreous-to-waxy luster, fibrous chatoyancy, no prominent cleavage, specific gravity about 2.64–2.71. The rounded, polished form is human-processed but remains geological material.
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Physical properties
Mohs hardness 6.5–7; golden-brown to dark brown silky bands, vitreous-to-waxy luster, fibrous chatoyancy, no prominent cleavage, specific gravity about 2.64–2.71. The rounded, polished form is human-processed but remains geological material.
Formation & geological history
Forms when quartz replaces parallel asbestos-like crocidolite fibers, preserving the fibrous structure that produces the reflective “cat’s-eye” effect. Major deposits are associated with Precambrian iron formations, especially in South Africa and Western Australia.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and ornamental objects; it has little industrial use beyond decorative quartz products.
Geological facts
Its strongest chatoyancy appears as a bright band that shifts when the stone is rotated under a direct light. Red “bull’s-eye” and blue “hawk’s-eye” are related varieties.
Field identification & locations
Identify it by its parallel golden bands and moving, silky reflective stripe; it should not show glittery mica flakes or glass-like transparency. Common sources include South Africa, Australia, India, Brazil, and the United States.
