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  PAIR TOURMALINE SLICE        NATURAL COLOR         Hardness 7.5



75.83 cts. Pair Polychrome tourmaline  Slice

40.1 x  37.5 mm. Thickness 3.2 mm.

Slightly included. Enhancement: none (N)

pair PRICE   USD 766.00 

ORIGIN: Madagascar

    ref: pairTsl7583 

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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