Qingqing: Tiger's Eye

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Polished tiger's eye gemstone

Tiger iron

Egg shape tiger's eye with iron stripes
Tiger's eye (also called Tigers eye or Tiger eye) is a chatoyant gemstone that is usually a metamorphic rock that is yellow- to red-brown, with a silky luster. A member of the quartz group, it is a classic example of pseudomorphous replacement by silica of fibrous crocidolite (blue asbestos). An incompletely silicified blue variant is called Hawk's eye.
The gems are usually cut en cabochon in order to best display their chatoyancy. Red stones are brought about through gentle heat treatment. Honey-coloured stones have been used to imitate the much higher valued cat's eye chrysoberyl (cymophane), but the overall effect is unconvincing. Artificial fiberoptic glass is a common imitation of tiger's eye, and is produced in a wide range of colors. Tiger's Eye mostly comes from South Africa.
Tiger iron is an altered rock composed chiefly of tiger's eye, red jasper, and black hematite. The undulating, contrasting bands of colour and luster make for an attractive motif, and it is mainly used for jewelry-making and ornamentation. Tiger iron is a popular ornamental material used in a variety of applications, from beads and cabochons to knife hilts. Along with tiger's eye it is mined primarily in South Africa and Western Australia. Tiger's eye is primarily composed of silicon dioxide (SiO2) and the specific gravity ranges from 2.64 -2.71.[1] Formed by the alteration of crocidolite and consists essentially of quartz colored by iron oxide. Origin: South Africa and Australia
Locations
Notable sources of tiger's eye include the USA, South Africa, Canada, China, Brazil, Namibia, India, and Burma.
References
^ http://ist-socrates.berkeley.edu/~eps2/wisc/sg.html Berkeley.edu
GSA Comment and Reply on formation of Tiger's and Hawk's Eye

v?d?eJewellery materials
Precious metals:
Gold Palladium Platinum Rhodium Silver
Precious metal alloys:
Colored gold Electrum Platinum sterling Sterling silver
Base metals/alloys:
Brass Bronze Copper Stainless steel
Mineral Gemstones:
Aventurine Agate Alexandrite Amethyst Aquamarine Carnelian Citrine Diamond Emerald Garnet Jade Jasper Malachite Lapis lazuli Moonstone Onyx Opal Peridot Quartz Ruby Sapphire Sodalite Sunstone Tanzanite Tiger's Eye Topaz
Organic Gemstones:
Amber Copal Coral Jet Pearl

v?d?eSilica minerals
Crystalline
Coesite Cristobalite Moganite Quartz Stishovite Tridymite
Cryptocrystalline
Chalcedony Chert Flint Jasper
Amorphous
Fulgurite Lechatelierite Opal
Miscellaneous
Quartzite Tiger's eye Vitreous quartzite
Notable varieties
Chalcedony
Agate Carnelian Chrome chalcedony Chrysoprase Heliotrope Moss agate Lake Superior agate Onyx
Jasper/ Chert
Mozarkite Orbicular jasper
Opal
Fiorite Geyserite
Quartz
Amethyst Ametrine Citrine Milky quartz Rose quartz Smoky quartz Shocked quartz
Categories: Gemstones | Quartz varieties(and so on)