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GREEN TOURMALINE                        Hardness 7.5 
Online Certificate

 13.31 cts. Green tourmaline oval Single 

16.8  x 12 mm.

Loupe clean. Tone scale: medium-light. This stone has an obviously bluish Green color under daylight, and a more greenish color under incandescent light.

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ORIGIN: Zambia 


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Tourmaline Discovery
Hardness: 7 - 7.5
Specific Gravity: 3.0+    Visual Catalog

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Tourmaline data

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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