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| ACHROÏTE TOURMALINE NATURAL COLOR Hardness 7.5 |
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4.34 cts. Achroïte tourmaline octagon single 9.6 x 7.7 mm. Depth: 7.4 mm. Eye clean. Enhancement: none (N) stone PRICE USD 564.00 ORIGIN: Madagascar ref:ATe434
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| Hardness: | 7 - 7.5 | ||
| Specific Gravity: | 3.0+ | ||
| Refractive Index: | 1.62 - 1.68 | 
Visual Catalog |
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| Chemical Composition: | Na(Li,Al)3Al6Si6O18(BO3)3 (OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide |  Tourmaline
data |
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| Crystal Structure: | Trigonal | 
Cutting Styles |
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| Tourmaline Discovery | 
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