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  TOURMALINE SLICE           NATURAL COLOR            Hardness 7.5

RETURN TO TOURMALINE SLICE

 

 40.61 cts.  polychromatic tourmaline Slice  

  35.4 x 32.5 mm. Stone found in alluvium.)

Moderately included.  Enhancement: none (N)

stone PRICE  USD 430.00 

ORIGIN: Madagascar

  ref: Tsl 4061 

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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