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  TOURMALINE SLICE           NATURAL COLOR            Hardness 7.5

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66 grms. Polychrome tourmaline Slice

91.5 x 89.4 mm. Thickness: 3.5 mm.    (Stone found in alluvium.)

Moderately included. Enhancement: none  (N)

stone PRICE     USD 2000.00 

ORIGIN: Madagascar

    ref: Tsl66g   

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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