7,89 ct Green Tourmaline

A emerald Cut Intens green ALGN certified Verdelite Tourmaline.
Species ....................................................................... Natural Tourmaline
Variety .............................................................................................. Verdelite
DESCRIPTION
Shape & Cutting Style ........................ Octagon Emerald, Step Cut
Measurements .............................................. 15.45 x 9.81 x 4.94 mm
Carat Weight ............................................................................. 7.89 Carat
Color ...................................................................... Intense Green (Bluish)
Transparency ......................................................................... Transparent
MAIN PROPERTIES OF TOURMALINE
Chemical Composition ........... Na(Li,Al)3Al6B3Si6O27(OH)3(OH,F)
Crystal System ........................................................................... Trigonal
Mohs Hardness ......................................................................... 7.0 - 7.5
Specific Gravity ...................................................... 2.84 - 3.40 g/cm3
Optical Character ..................................................................... Uniaxial
Refractive Index ............................................................. 1.603 - 1.666
Birefringence ................................................................... 0.013 - 0.034