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Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.
Pietersite is often inaccurately described as a brecciated form of tiger's-eye or hawk's-eye, due to the brecciated texture containing chatoyant material. However, while they are similar mineralogically, pietersite is not a brecciated form of either.
Chatoyancy is caused by either the presence of fibrous structures within the material, such as in tiger's eye quartz, or by fibrous inclusions and cavities, as seen in cat's eye chrysoberyl. In cat's eye chrysoberyl, the chatoyant effect is caused by the presence of rutile, composed mostly of titanium dioxide, which aligns perpendicularly to ...
Most varieties weak; definite in smoky quartz Streak: White Specific gravity: 2.65 constant; variable in impure varieties Melting point: Solubility: Major varieties (or Related minerals ) One way to do it: Chalcedony, Agate, Onyx, Jasper, Aventurine, Tiger's eye, Rock Crystal, Amethyst, Citrine, Rose quartz, Milk quartz (or snow quartz), Carnelian
A classic example is tiger's eye quartz, crocidolite asbestos replaced by silica. While quartz typically forms prismatic (elongate, prism-like) crystals, in tiger's eye the original fibrous habit of crocidolite is preserved.
Tiger's eye; Helenite (artificial glass made from volcanic ash) Iddingsite; Kimberlite; Lamproite; Lapis lazuli; Libyan desert glass; Llanite; Maw sit sit; Moldavite; Obsidian; Apache tears; Pallasite; Peridotite (also known as olivinite) Siilinjärvi carbonatite; Soapstone (also known as steatite) Tactite; Tiger's eye; Unakite
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