Vanadiumdravite
| Refractive Index : 1.786 – 1.729 |
| Optical Characteristic : DR, uniaxial negative |
| Specific Gravity : 3.32 |
| Formula : NaMg3V6(Si6O18)(BO3)3(OH)4 |
| Crystal System : Trigonal |
| Variety/Species : Tourmaline |
| Species/Group : Tourmaline Group |
| Birefringence : 0.057 |
| Dispersion : 0.017 |
| Hardness : 7.5 |
| Toughness : Fair |
| Ultrasonic : Risky |
| Steam : Risky |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : 2 colors |
| Strength : Moderate to strong |
|
|
| Pleochroism Colors : No data |
| Heat : May fracture or change color |
| Acids : No reaction |
| Light : Stable |
| Polish Luster : Resinuous |
| Fracture : |
| Fracture Luster : |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : N/A |
| Enhancements : None |
| Cleavage : None |
| Color Range : Dark green, green, black greenish, blackish |
| Transparency : Translucent to opaque |
| Phenomena : None |
|
|
| Separations : Vanadiumdravite from- |
| Identifying Characteristics and information Thread-like liquid and gas inclusions, gas filled fractures.Vanadiumdravite is a very rare stone and not often seen as a gem. |
| Spectral Data Not diagnostic |
| Trade Names and Misnomers Vanadiumdravite |
Tags: Tourmaline, Tourmaline Group, Trigonal
Bookmark and Share!
Comments
No comments yet.
RSS feed for comments on this post. TrackBack URI
Leave a comment, tip or suggestion
You must be logged in to post a comment.