Falcon's Eye
A variety of 'Tiger's Eye'
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About Falcon's Eye
Trade name for a blue variety of Tiger's Eye (in fact unreplaced crocidolite). The blue colour is caused by Fe2+ compared to Fe3+ in the (oxidised) yellow/brown Tiger's Eye.
Heaney & 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."
Visit gemdat.org for gemological information about Falcon's Eye.
Heaney & 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."
Visit gemdat.org for gemological information about Falcon's Eye.Unique Identifiers
Mindat ID:
38866 (as Falcon's Eye)
3960 (as Tiger's Eye)
3960 (as Tiger's Eye)
Long-form identifier:
mindat:1:1:38866:7 (as Falcon's Eye)
mindat:1:1:3960:0 (as Tiger's Eye)
mindat:1:1:3960:0 (as Tiger's Eye)
Synonyms of Falcon's Eye
Other Language Names for Falcon's Eye
German:Falkenauge
Common Associates
Associations Based on Photo Data:
| 3 photos of Falcon's Eye associated with 'Tiger's Eye' | |
| 1 photo of Falcon's Eye associated with 'Crocidolite' | ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2 |
| 1 photo of Falcon's Eye associated with Riebeckite | ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2 |
| 1 photo of Falcon's Eye associated with Hematite | Fe2O3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Falcon's Eye
mindat.org URL:
https://www.mindat.org/min-38866.html
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References for Falcon's Eye
Localities for Falcon's Eye
Showing 1 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| BHP |
Northern Cape, South Africa