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LOOSE GREEN TOURMALINE      NATURAL COLOR      Hardness 7.5 
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RETURN TO TOURMALINE GREEN
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.
2.05 cts. Cushion tourmaline faceted single
  x Pieces: 1 Tourmaline x x Type: 100% Natural
 
  Color: Green   Shape: Cushion
                 
  Weight: 2.05 Carats   Size: 7.1 x 7.1 mm
 
  Clarity: FL   Luster: Excellent
 
  Treatment: None (N)   Origin: Afghanistan
We use a  microscopic photography system.   Refr. Index: 1.62-1.64   Hardness 7.5
The actual gemstone is smaller than the images shown.
                                                      
Stone Price:  SOLD

ref:Tgc205

 

 Depth:5.8  mm.

 

   
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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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