Watermelon Tourmaline
| Refractive Index : 1.644 – 1.624 (+ 0.011 – 0.009) |
| Optical Characteristic : DR, U- |
| Specific Gravity : 3.06 + 0.20 – 0.06 |
| Formula : Na(Li,AI)3AI6(BO3)3Si6018(OH)4 |
| Crystal System : Trigonal |
| Variety/Species : Elbaite |
| Species/Group : Tourmaline Group |
| Birefringence : 0.018 to 0.040 |
| Dispersion : 0.017 |
| Hardness : 7 to 7.5 |
| Toughness : Fair |
| Ultrasonic : Risky |
| Steam : Risky |
| UV Long : Inert to weak |
| UV Short : Inert to weak |
| Pleochroism : 2 colors |
| Strength : Weak to strong |
|
|
| Pleochroism Colors : Green tones or Green/brown |
| Heat : May fracture or change color |
| Acids : No reaction |
| Light : Stable |
| Polish Luster : Vitreous |
| Fracture : Conchoidal |
| Fracture Luster : Vitreous |
| Clarity Type : I to III |
| Tones : 2-8 |
| Saturations : 1-5 |
| Cause of Color : Green-iron, chromium, vanadium; pink-maganese |
| Enhancements : Heating, Irradiation, acid treatment |
| Cleavage : None |
| Color Range : Pink and green, gren and pink, particolor, multicolor. Pink in the center with a “rind”of green similar to watermelon. |
| Transparency : Transparent to Opaque |
| Phenomena : Color change, (rare), aventurescence, chatoyancy |
|
|
| Separations : Watermelon Tourmaline from- Unique appearance |
| Identifying Characteristics and information Thread-like liquid and gas inclusions,gas filled fractures. Birefringence is usually0.018 – 0.020 |
| Spectral Data Not diagnostic. Weak spectra usually observed |
| Trade Names and Misnomers Watermelon Tourmaline |
Tags: Elabite, Tourmaline Group, watermelon tourmaline
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.