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  TOURMALINE SLICE           NATURAL COLOR            Hardness 7.5

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121 grms. Set  polychromatic tourmaline Slice

62  x 53 mm.  This stone was found in alluvium.

Moderately included.  Enhancement: none (N)

       set PRICE (5 pcs)   SOLD 

ref: Set Tsl 121g  ORIGIN: Alakamisy Itenina, Madagascar

                                                                   

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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