Vlasovite
| Refractive Index : 1.628 – 1.607 |
| Optical Characteristic : DR, biaxial negative |
| Specific Gravity : 2.97 |
| Formula : Na2ZrSi4O11 |
| Crystal System : Monoclinic |
| Variety/Species : All |
| Species/Group : Vlasovite |
| Birefringence : 0.021 |
| Dispersion : |
| Hardness : 6 |
| Toughness : Poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert |
| UV Short : Inert to moderate |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : Sensitive |
| Acids : Sensitive |
| Light : Stable |
| Polish Luster : Greasy |
| Fracture : Uneven to conchoidal |
| Fracture Luster : Vitreous to greasy |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : |
| Enhancements : None |
| Cleavage : Distinct |
| Color Range : Colorless, yellow, brown, pink |
| Transparency : Transparent |
| Phenomena : None |
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| Separations : Vlasovite from- |
| Identifying Characteristics and information Rare and usually cut for collectors |
| Spectral Data Not diagnostic |
| Trade Names and Misnomers Vlasovite |
Tags: Monoclinic, Vlasovite
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