Archive for the Serpentine Group Category

  • Verd-antique

     

    Refractive Index : 1.570 – 1.560 (+ 0.004 – 0.070)

    Optical Characteristic : DR, AGG

    Specific Gravity : 2.57 (+ 0.23 – 0.13)

    Formula : (Mg,Fe,Ni)3Si2O5(OH)4

    Crystal System : Monoclinic

    Variety/Species : Verd-antique

    Species/Group : Serpentine Group

    Birefringence : None

    Dispersion : None

    Hardness : 2.5 to 6

    Toughness : Poor

    Ultrasonic : Never

    Steam : Risky

    UV Long : Inert to weak

    UV Short : Inert

    Pleochroism : None

    Strength [...]

  • Williamsite

     

    Refractive Index : 1.570 – 1.560 (0.004 – 0.070)

    Optical Characteristic : DR, AGG

    Specific Gravity : 2.57 (+ 0.23 -0.13)

    Formula : (Mg,Fe,Ni)3Si2O5(OH)4

    Crystal System : Monoclinic

    Variety/Species : Antigorite

    Species/Group : Serpentine Group

    Birefringence : None

    Dispersion : None

    Hardness : 2.5 to 6

    Toughness : Poor

    Ultrasonic : Never

    Steam : Risky

    UV Long : Inert to weak

    UV Short : Inert

    Pleochroism : None

    Strength : N/A

    Pleochroism [...]