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LOOSE GREEN TOURMALINE     NATURAL COLOR     Hardness 7.5  
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RETURN TO GREEN TOURMALINE
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, marble and schists, placers.
Coloured tourmalines are related to sodolithic pegmatites.
One distinguishes two principal types of tourmalines: the hexagonal type and the triangular one.
2.88 cts. Octagon green tourmaline single
  x Pieces: 1 Tourmaline x x Type: 100% Natural
 
  Color: Green medium   Shape: Emerald cut
                 
  Weight: 2.88 Carats   Size: 11.8 x 5.8  mm.
 
  Clarity: Slightly included.   Luster: Good
 
  Treatment: None (N)   Origin: Madagascar
We use a  microscopic photography system.   Refr. Index: 1.62-1.64   Hardness 7.5
The actual gemstone is smaller than the images shown.
 Untreated in any way
                                                                    
Stone Price: SOLD

ref:Tge288

 

 

Depth:4.8 mm.

   
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