Verdelite
| Refractive Index : 1.644-1.624 (+.011 -.009) |
| Optical Characteristic : DR, uniaxial negative |
| Specific Gravity : 3.06 (+.20 -.06) |
| Formula : Na(Li,AI)3AI6(BO3)3Si6018(OH)4 |
| Crystal System : Trigonal |
| Variety/Species : Elbaite |
| Species/Group : Tourmaline Group |
| Birefringence : .018 to .040 |
| Dispersion : .017 |
| Hardness : 7 to 7.5 |
| Toughness : Fair |
| Ultrasonic : Risky |
| Steam : Risky |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : 2 colors |
| Strength : Weak to strong |
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| Pleochroism Colors : Green-yellow live green |
| Heat : May fracture or change color |
| Acids : No reaction |
| Light : Stable |
| Polish Luster : Vitreous |
| Fracture : Conchoidal |
| Fracture Luster : Vitreous |
| Clarity Type : I |
| Tones : 2-8 |
| Saturations : 1-5 |
| Cause of Color : Green-iron,chromium,vanadium |
| Enhancements : Heating,Irradiation,acid treatment |
| Cleavage : None |
| Color Range : Bluish green,green,yellowish green Greenish |
| Transparency : Transparent to Opaque |
| Phenomena : Color change(rare), aventurescence, chatoyancy |
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| Separations : Verdelite from- Andalusite : Birefringence, optic chracter, pleochroism, SG Peridot : RI, SG, birefringence, optic chracter, pleochroism, spectrum |
| Identifying Characteristics and information Thread-like liquid and gas inclusions,gas filled fractures.Birefrigence is usually .018-.020 |
| Spectral Data Not diagnostic.Weak spectra usually observed |
| Trade Names and Misnomers Verdelite |
Tags: Verdelite
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