Cymophane
Brazil
1.39 carats
© Mineral Classics
Chatoyancy is caused by light reflecting from inclusions of tiny parallel needles or hollow tubes. The finest quality cat's eye should be sharp, intense, well-centered, correctly oriented. Silver-white colour band is preferred. Most-prized bodycolor is semi-transparent golden-yellow to slightly greenish-yellow or brownish yellow "honey" color.
Cat's eye chrysoberyl can exhibit "Opening and Closing" and "Milk and Honey" effects.
Cymophane Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
|  |  |  |
 |  |  |  |  |  |
Cymophane Gemstones by Size
This table shows distribution of Cymophane gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.77 cts
Heaviest:7.27 cts
Average:1.91 cts
Total photos:10
Do you have a larger Cymophane? Why not upload a photo?
| General Information | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Chrysoberyl | |||||||||
| Chemical Formula |
| |||||||||
| Cymophane Treatments | ||||||||||
| Irradiation of light variety produces dark (olive)-brown color: may be radioactive. - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 3 | ||||||||||
| Cymophane Simulants | ||||||||||
| Cat's eye quartz, cat's eye tourmaline, bleached tiger's eye quartz, glass. - GIA 2019 | ||||||||||
| Synthetic Cymophane | ||||||||||
| In 1987 Japan's Kyocera Corporation created commercially-available synthetic cat's eye color-change alexandrite, which is a rare combination. - GIA 2019 | ||||||||||
| Physical Properties of Cymophane | ||||||||||
| Mohs Hardness | 8.5, Blue Chart Gem Identification (2010) | |||||||||
| Specific Gravity | 3.69 to 3.81, Blue Chart Gem Identification (2010) | |||||||||
| Optical Properties of Cymophane | ||||||||||
| Refractive Index | 1.739 to 1.770+, Blue Chart Gem Identification (2010) | |||||||||
| Optical Character | Biaxial/+,-, Blue Chart Gem Identification (2010) | |||||||||
| Birefringence | 0.007 to 0.013, Blue Chart Gem Identification (2010) | |||||||||
| Chatoyancy | Bluish (or yellowish according to other sources) chatoyancy, Management Team (2012) | |||||||||
| Colour | ||||||||||
| Colour (General) | Yellow, green, Blue Chart Gem Identification (2010) | |||||||||
| Transparency | Transparent,Translucent, Gems, Sixth Edition (2006) | |||||||||
| Lustre | Vitreous, Gems, Sixth Edition (2006) | |||||||||
| Crystallography of Cymophane | ||||||||||
| Crystal System | Orthorhombic, Blue Chart Gem Identification (2010) | |||||||||
| Inclusions in Cymophane | ||||||||||
| Microscopic tube-like cavities or needle-like inclusions of rutile in an orientation parallel to the c-axis - mindat.org | ||||||||||
| Further Information | ||||||||||
| Mineral information: | Cymophane information at mindat.org | |||||||||
| Significant Gem Localities | ||||||||||
| ||||||||||