A variety of
Tiger's EyeTrade name for a blue variety of Tiger's Eye. The blue is caused by Fe2+ compared to Fe3+ in the yellow/brown Tiger's Eye.
New interpretation of the origin of tiger's-eye
Peter J. Heaney*,1 and Donald M. Fisher*,1
1 Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA
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.
Geology, April 2003, v. 31 (4): 323-326
