Archive for the Beryl Category

  • Trapiche Emerald

    Refractive Index : 1.583-1.577 + 0.017 – 0.017

    Optical Characteristic : DR, U-

    Specific Gravity : 2.72 + 0.18 – 0.05

    Formula : Be3AI2Si6O18

    Crystal System : Hexagonal

    Variety/Species : Trapiche emerald

    Species/Group : Beryl

    Birefringence : 0.005 to 0.009

    Dispersion : 0.014

    Hardness : 7.5 to 8

    Toughness : Poor to good

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert to strong

    UV Short : Inert [...]

  • Emerald

    Refractive Index : 1.583 – 1.577 (+0.017 – 0.017)

    Optical Characteristic : DR U-

    Specific Gravity : 2.72 (+0.18 – 0.05)

    Formula : Be3AI2Si6O18

    Crystal System : Hexagonal

    Variety/Species : Emerald

    Species/Group : Beryl

    Birefringence : 0.005 to .009

    Dispersion : 0.014

    Hardness : 7.5 to 8

    Toughness : Poor to good

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert to strong

    UV Short : Inert to [...]

  • Beryl

    Refractive Index : 1.577 – 1.583 (+0.017 – 0.017)

    Optical Characteristic : DR, Uniaxial negative

    Specific Gravity : 2.72 (+0.18 – 0.05)

    Formula : Be3AI2Si6O18

    Crystal System : Hexagonal

    Variety/Species : Beryl

    Species/Group : Beryl

    Birefringence : 0.005 – 0.009

    Dispersion : .014

    Hardness : 7.5 to 8

    Toughness : Good

    Ultrasonic : Risky

    Steam : Risky

    UV Long :

    UV Short : Inert

    Pleochroism : Colorless beryl – Inert [...]