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Tiger's Eye

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System:TrigonalColour:Yellow-brown
Lustre:VitreousHardness:7
A Mixture Of:Limonite, Quartz, Riebeckite


Common name for a variety of quartz which is chatoyant because of parallel intergrowth of quartz crystals and altered amphibole fibres that mostly turned into limonite. Much used as an ornamental and lapidary rock.
See also Tiger Iron.

A new interpretation of the origin of tiger's eye was recently given by Heaney and Fisher (2003): "Tiger's-eye is an attractive and popular gemstone that is ubiquitous in stores that cater to rock and mineral collectors. For more than a century, textbooks and museum displays have identified the material as an archetype of pseudomorphism, i.e., the replacement of one mineral by another with the retention of the earlier mineral's shape. Our study has revealed that the textures responsible for the shimmer of tiger's-eye do not represent pseudomorphic substitution of quartz after preexisting crocidolite asbestos. Rather, we argue that tiger's-eye classically exemplifies synchronous mineral growth through a crack-seal vein-filling process."





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Classification of Tiger's Eye

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Physical Properties of Tiger's Eye

Lustre:Vitreous
Colour:Yellow-brown
Hardness (Mohs):7

Crystallography of Tiger's Eye

Crystal System:Trigonal

Other Names for Tiger's Eye

Synonyms:
PseudocrocidoliteTiger Eye
Other Languages:
French:Oeil-de-tigre
German:Tigerauge
Varieties:
Blue Tiger's EyeFalcon's Eye

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tiger's Eye

Reference List:

- +
Heaney, P. J. & Fisher, D. M. (2003): New interpretation of the origin of tiger's-eye. Geology, 31, 323-326.

Internet Links for Tiger's Eye

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