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  TOURMALINE SLICE           NATURAL COLOR            Hardness 7.5

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89.23 cts. Polychrome tourmaline Slice

47.7 x 35.8 mm. Thickness: 5 mm.  (Stone found in alluvium.)

Slightly included. Enhancement: none  (N)

stone PRICE    USD 860.00 

ORIGIN: Madagascar

   ref: Tsl8923  

Hardness: 7 - 7.5

Growth zoning in a tourmaline crystal.

Specific Gravity: 3.0+
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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