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| TOURMALINE CRYSTAL
NATURAL COLOR
Hardness
7.5 |
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TOURMALINE
CRYSTAL
6.48
cts. tourmaline crystal Single
21.5
x 6.7 mm. Triangular
type
Enhancement: none (N)
stone PRICE
USD 125.00 ref:Tr
ORIGIN: Madagascar |
| Hardness: |
7
- 7.5 |
| Specific
Gravity: |
3.0+ |
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| Refractive
Index: |
1.62
- 1.68 |
 Tourmaline
data |
| Chemical
Composition: |
Na(Li,Al)3Al6Si6O18(BO3)3
(OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide |
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| Crystal
Structure: |
Trigonal |
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