Falcon's Eye
A trade name for a greyish-green to greyish-blue Tiger's eye.
Chatoyancy is caused by fibrous structure.
Chatoyancy is caused by fibrous structure.
| General Information | ||||||
|---|---|---|---|---|---|---|
| A variety or type of: | Tiger's Eye, which is a variety of Quartz | |||||
| Other Names/Trade Names: | ||||||
| Chemical Formula |
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| Physical Properties of Falcon's Eye | ||||||
| Mohs Hardness | 7, Gemstones of the world (2001) More from other references | |||||
| Specific Gravity | 2.58 to 2.64, Gemstones of the world (2001) | |||||
| Cleavage Quality | None, Gemstones of the world (2001) | |||||
| Fracture | Irregular, Gemstones of the world (2001) | |||||
| Optical Properties of Falcon's Eye | ||||||
| Refractive Index | 1.534 to 1.540, Gemstones of the world (2001) | |||||
| Birefringence | None, Gemstones of the world (2001) | |||||
| Pleochroism | Absent, Gemstones of the world (2001) | |||||
| Dispersion | None, Gemstones of the world (2001) | |||||
| Chatoyancy | Chatoyant, Gemstones of the world (2001) | |||||
| Colour | ||||||
| Colour (General) | Blue-grey to blue-green, Gemstones of the world (2001) More from other references | |||||
| Causes of Colour | The blue colour is caused by Fe2+ compared to Fe3+ in the (oxidised) yellow/brown Tiger's Eye, Management Team (2012) | |||||
| Transparency | Opaque, Gemstones of the world (2001) | |||||
| Lustre | Silky, Gemstones of the world (2001) on fracturesMore from other references | |||||
| Fluorescence & other light emissions | ||||||
| Fluorescence (General) | None, Gemstones of the world (2001) | |||||
| Crystallography of Falcon's Eye | ||||||
| Crystal System | Trigonal, Gemstones of the world (2001) More from other references | |||||
| Habit | Fibrous aggregate, Gemstones of the world (2001) | |||||
| Further Information | ||||||
| Mineral information: | Falcon's Eye information at mindat.org | |||||