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TOURMALINE SLICE NATURAL
COLOR Hardness
7.5 |
 |
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tourmaline slice
32.63
cts. Set Slice polychromatic tourmaline
18.7 x 18.2 mm.
Moderately included.
Enhancement: none (N)
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set PRICE USD 269.00
ORIGIN: Madagascar 
ref:
Tsl 3263
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| Hardness: |
7
- 7.5 |
Growth
zoning in a tourmaline crystal. |
| Specific
Gravity: |
3.0+ |
| Refractive
Index: |
1.62
- 1.68 |
| Chemical
Composition: |
Na(Li,Al)3Al6Si6O18(BO3)3
(OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide |
| Crystal
Structure: |
Trigonal |
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