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| TOURMALINE SLICE NATURAL COLOR Hardness 7.5 |
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RETURN TO »» tourmaline slice
32.68 cts. Set Slice polychromatic tourmaline
18.7 x 18.2 mm. 
Moderately included. Enhancement: none (N)
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set PRICE USD 369.00
ORIGIN: Madagascar
 ref: Tsl 3268 
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| Hardness: |
7 - 7.5 |
Growth zoning in a tourmaline crystal.
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| 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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