metamorphic
Tiger's Eye and Gemstone Assortment
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
Hardness 7.0 (Mohs), colors include golden yellow, brown, and deep orange. Exhibit silky luster and chatoyancy (cat-eye effect). Most are cryptocrystalline quartz structures.
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Physical properties
Hardness 7.0 (Mohs), colors include golden yellow, brown, and deep orange. Exhibit silky luster and chatoyancy (cat-eye effect). Most are cryptocrystalline quartz structures.
Formation & geological history
Formed through the replacement of fibrous blue crocidolite asbestos by silica, maintaining the fibrous structure. Primarily found in Precambrian iron formations.
Uses & applications
Used extensively in jewelry, ornamental carvings, pocket stones, and decorative cabochons.
Geological facts
Tiger's Eye is a classic example of a pseudomorph. If the material is blue, it is known as Hawk's Eye; if it is heated or naturally altered, it can turn red.
Field identification & locations
Identify by moving the stone under a light source to see the shifting bands of light (chatoyancy). Common in South Africa, Australia, and Namibia. Popular for beginner collectors.
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