Archive for the Garnet Group Category

  • Topazolite

    Refractive Index : 1.888 + 0.007 – 0.033

    Optical Characteristic : SR, ADR

    Specific Gravity : 3.84 + 0.03 – 0.03

    Formula : Ca3Fe+++2(SiO4)3

    Crystal System : Cubic

    Variety/Species : Ugrandite/Andradite

    Species/Group : Garnet Group

    Birefringence : None

    Dispersion : 0.057

    Hardness : 6.5 to 7

    Toughness : Fair to good

    Ultrasonic : Uaually safe

    Steam : Never

    UV Long : Inert

    UV Short : Inert to moderate

    Pleochroism : [...]

  • Tsavorite

    Tsavorite Garnet

    Refractive Index : 1.740 + 0.020 – 0.070

    Optical Characteristic : SR, ADR

    Specific Gravity : 3.61 + 0.12 – 0.04

    Formula : Ca3AI2(SiO4)3

    Crystal System : Cubic

    Variety/Species : Ugranite/Grossular

    Species/Group : Garnet group

    Birefringence : None

    Dispersion : 0.028

    Hardness : 7 to 7.5

    Toughness : Fair to good

    Ultrasonic : Usually safe

    Steam : Never

    UV Long : Inert to weak

    UV Short : Inert [...]

  • Uvarovite

    Natural Uvarovite Gemstone

    Refractive Index : 1.870 – 1.740

    Optical Characteristic : SR

    Specific Gravity : 3.80 – 3.40

    Formula : Ca3Cr2Si3O12

    Crystal System : Cubic

    Variety/Species : Ugrandite

    Species/Group : Garnet Group

    Birefringence : N/A

    Dispersion : N/A

    Hardness : 7 to 7.5

    Toughness : Poor

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert

    UV Short : Inert

    Pleochroism : None

    Strength : N/A

    Pleochroism Colors : None

    Heat : [...]

  • YAG

     

    Refractive Index : 1.833 (+ 0.010 – 0.010)

    Optical Characteristic : SR

    Specific Gravity : 4.60 to 4.50

    Formula : Y3AI5O12

    Crystal System : Cubic

    Variety/Species : Yttrium Aluminum Garnet

    Species/Group : Garnet (Man-made)

    Birefringence : None

    Dispersion : 0.028

    Hardness : 8.25

    Toughness : Good

    Ultrasonic : Uaually safe

    Steam : Usually safe

    UV Long : Inert to strong

    UV Short : Inert to strong

    Pleochroism : None

    Strength : [...]

  • Star Garnet

    Star Almandite

    Refractive Index : 1.790 (+0.030 – 0.030)

    Optical Characteristic : SR, ADR

    Specific Gravity : 4.05 (+0.25 – 0.12)

    Formula : Fe++3AI2(SiO4)3

    Crystal System : Cubic

    Variety/Species : Almandite

    Species/Group : Garnet group

    Birefringence : none

    Dispersion : 0.024

    Hardness : 7 to 7.5

    Toughness : Fair to good

    Ultrasonic : Usually safe

    Steam : Never

    UV Long : Inert

    UV Short : Inert

    Pleochroism : None

    Strength : N/A

    Pleochroism [...]