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Online Certificate
Tourmaline chemical composition is (Na, Li,Ca) (Fe2, Mg, Mn, Al)3 Al6 I(OH)4 I (BO3)3ISi6O18I .
Crystaline system: Trigonal.
Occurences: In the acid magmatic rocks and associated pegmatites, limestones and schists, placers.
Coloured tourmalines are related to sodolithic pegmatites.
One distinguishes two principal types of tourmalines: the hexagonal type and the triangular one.
2.22 cts. Cushion tourmaline single
Cushion green tourmaline gemstone, exclusive loose faceted tourmalines, Madagascar gemstones shopping x Pieces: 1 Tourmaline x x Type: 100% Natural
Color: Green Shape: Cushion
Weight: 2.22 Carats Size:  7.5 x 7.3 mm
Clarity: Very slightly included. Luster: Excellent
Treatment: None (N) Origin: Afghanistan
Color tone: medium Refr. Index: 1.62-1.64 Hardness 7.5
The actual gemstone is smaller than the images shown. Depth: 5.6 mm.
Stone Price:  USD 450.00



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Hardness: 7 - 7.5
Specific Gravity: 3.0+   Visual Catalog
Refractive Index: 1.62 - 1.68 Tourmaline data
Chemical Composition: Na(Li,Al)3Al6Si6O18(BO3)3 (OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide   Cutting Styles
Crystal Structure: Trigonal   Ask a question
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