Paraíba Tourmaline (Cuprian Elbaite)

Big Photo

Brazil
1.77 carats
© Palagems

The cuprian tourmaline from the Mina da Batalha in the Federal Brazilian State of Paraiba. An electrifying blue-to-green coloured, gemmy, variety of cuprian Elbaite.

Paraíba Tourmaline Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
A variety or type of:Cuprian Elbaite, which is a variety of Elbaite, which is a variety of Tourmaline
Paraíba Tourmaline Treatments
Color is often improved or modified by heat-treatment, typically purplish-violet to intense blue-green - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5
Paraíba Tourmaline Simulants
Beware of imitations such as synthetic hydrothermal beryl, apatite and assembled gems - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5
Physical Properties of Paraíba Tourmaline
Mohs Hardness7 to 7.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Specific Gravity3.04 to 3.13
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Optical Properties of Paraíba Tourmaline
Refractive Index1.618 to 1.643
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Optical CharacterUniaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Birefringence0.018 to 0.021
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
Colour (General)Intense "electrical" colors: typically mint-green to sky-blue, sapphire-blue, violet to purplish
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Crystallography of Paraíba Tourmaline
Crystal SystemTrigonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Further Information
Mineral information:Paraíba Tourmaline information at mindat.org
Significant Gem Localities
Brazil
 
  • Paraíba
    • Borborema mineral province
      • Salgadinho
        • São José da Batalha
Wilson, W. E. (2002): Cuprian elbaite from the Batalha Mine, Paraíba, Brazil. Mineralogical Record, 33: 127-137
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