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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.
  7.76 cts.Cushion green tourmaline single
  x Pieces: 1 Tourmaline x x Type: 100% Natural
 
  Color: Light Green   Shape: Cushion
                 
  Weight: 7.76 Carats   Size: 12.1 x 11.2  mm
 
  Clarity: SI2   Luster: Excellent
 
  Treatment: None (N)   Origin: Madagascar
Tone scale: Light-medium. This stone has an   Refr. Index: 1.62-1.64   Hardness 7.5
obviously bluish-green color under daylight,
the coloration is G under incandescent light. Depth:8.7 mm.
Stone Price:  USD 788.00

ref:Tgc 776   

   
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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
Tourmaline Discovery
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- Scale determining the purity of a stone.  -
FL NFL SI1 SI2 MI1
Flaw less Near flaw less Slightly included 1 Slightly included 2 Medium included 1
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MI2 MI3 VI1 VI2 HI
Medium included 2 Medium included 3 Very included 1 Very included 2 Highly included
 
 
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