metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 (Mohs scale), Color: Golden yellow to brown, Luster: Silky/Vitreous, Structure: Fibrous, Cleavage: None, Specific Gravity: 2.64-2.71
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Physical properties
Hardness: 7 (Mohs scale), Color: Golden yellow to brown, Luster: Silky/Vitreous, Structure: Fibrous, Cleavage: None, Specific Gravity: 2.64-2.71
Formation & geological history
Formed through a metamorphic process where quartz replaces the fibers of the mineral crocidolite (blue asbestos). It typically forms in Precambrian banded iron formations through the infiltration of silica-rich fluids.
Uses & applications
Predominantly used for jewelry, lapidary arts, carvings, and as a popular semi-precious gemstone for decorative objects and mineral collecting.
Geological facts
It exhibits chatoyancy, the 'cat-eye' effect, caused by the fibrous structure within the stone reflecting light. If the quartz replacement is incomplete, it may remain blue, known as Hawk's Eye.
Field identification & locations
Identify in the field by its distinct yellow-gold and brown bands and its unique chatoyant shimmer when rotated under light. Common locations include South Africa, Western Australia, and Namibia.
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