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TOURMALINE SLICE NATURAL
COLOR Hardness
7.5 |
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Set
tourmaline slice
23.49 cts.
Set sliced tourmaline
18.7 x 14.3 mm.
Moderately included. Enhancement: none
(N)
stone PRICE USD 209.00
ORIGIN: Madagascar
ref:
SetTosl2349c |
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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