Xanthite
| Refractive Index : 1.718 – 1.713 (+ 0.003 – 0.013) |
| Optical Characteristic : DR, Uniaxial positive, uniaxial negative, AGG |
| Specific Gravity : 3.40 (+ 0.10 – 0.15) |
| Formula : Ca10Mg2AI4(SiO4)5(Si2O7)2(OH)4 |
| Crystal System : Tetragonal |
| Variety/Species : Idocrase |
| Species/Group : Vesuvianite |
| Birefringence : 0.001 to 0.012 |
| Dispersion : 0.019 |
| Hardness : 6.5 |
| Toughness : Fair to good |
| Ultrasonic : Risky |
| Steam : Risky |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : Usually none |
| Strength : weak |
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| Pleochroism Colors : None |
| Heat : Fusible |
| Acids : Avoid hydrofluoric acid |
| Light : Stable |
| Polish Luster : Vitreous to greasy |
| Fracture : Conchoidal to granular |
| Fracture Luster : Vitreous to dull |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Iron |
| Enhancements : None |
| Cleavage : None |
| Color Range : Transparent Yellow to yellowish brownish |
| Transparency : Transparent to Opague |
| Phenomena : None |
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| Separations : Xanthite from- Jadeite : RI, spectrumSpinel : optic character, birefringenceNephrite : RI, SG, spectrum Zoisite : biorefrigence, optic character, spectrum Kyanite : birefrigence, optic character, spectrum, cleavage, SG |
| Identifying Characteristics and information Transparent idocrase may appear SR on refractometer showing strain in the polariscope. |
| Spectral Data Strong line at 4610. Weak line at 5285 |
| Trade Names and Misnomers Xanthite |
Tags: Idocrase, Vesuvianite, Xanthite
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