Archive for the Triclinic Category

  • Sunstone

    Refractive Index : 1.590 – 1.527

    Optical Characteristic : DR, B-, AGG

    Specific Gravity : 2.77 – 2.57

    Formula : (Na,Ca)(Si,AI)4O8

    Crystal System : Triclinic

    Variety/Species : Oligoclase/Plagioclase

    Species/Group : Feldspar group

    Birefringence : 0.007 to 0.010

    Dispersion : N/A

    Hardness : 6 to 6.5

    Toughness : poor

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert

    UV Short : Inert

    Pleochroism : None

    Strength : N/A

    Pleochroism Colors : None

    Heat [...]

  • Turquoise-Synthetic

    Refractive Index : 1.610-1.590(1.61 Spot)

    Optical Characteristic : AGG

    Specific Gravity : 2.75-2.68

    Formula : CuAI6(PO4)4(OH)8.4(H20)

    Crystal System : Triclinic

    Variety/Species : All

    Species/Group : Turquoise-Synthetic

    Birefringence : None

    Dispersion : N/A

    Hardness : 5 to 6

    Toughness : Poor to good

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert to weak

    UV Short : Inert

    Pleochroism : None

    Strength : N/A

    Pleochroism Colors : None

    Heat : Avoid Heating

    Acids : [...]

  • Ulexite

    Refractive Index : 1.65 – 1.519

    Optical Characteristic : DR, Biaxial -

    Specific Gravity : 1.95-1.65

    Formula : NaCaB5O6(OH)6.5(H2O)

    Crystal System : Triclinic

    Variety/Species : All

    Species/Group : Ulexite

    Birefringence : 0.023

    Dispersion : N/A

    Hardness : 1 to 2.5

    Toughness : Poor

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert

    UV Short : Inert to moderate

    Pleochroism : None

    Strength : N/A

    Pleochroism Colors : None

    Heat : Sensitive

    Acids : [...]

  • Kyanite

    Refractive Index : 1.731 – 1.716 (+0.004 – 0.004)

    Optical Characteristic : DR B-

    Specific Gravity : 3.68 (+0.01 – 0.12)

    Formula : AI2SiO5=Ai[6]AI[6]OSiO4

    Crystal System : Triclinic

    Variety/Species : All

    Species/Group : Kyanite

    Birefringence : 0.012 to 0.017

    Dispersion : 0.020

    Hardness : 4 to 7.5

    Toughness : Poor

    Ultrasonic : Never

    Steam : Never

    UV Long : Weak

    UV Short : Inert

    Pleochroism : 3 colors

    Strength : Moderate [...]

  • Labradorite

    Refractive Index : 1.568 – 1.599 (+0.005 – 0.005)

    Optical Characteristic : DR B +

    Specific Gravity : 2.70 (+0.05 – 0.05)

    Formula : (Ca,Na)(Si,AI)4O8

    Crystal System : Triclinic

    Variety/Species : Plagioclase Feldspar

    Species/Group : Feldspar Group

    Birefringence : 0.007 to 0.010

    Dispersion : N/A

    Hardness : 6 to 6.5

    Toughness : Poor

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert to Weak

    UV Short : Inert [...]

  • Weloganite

     

    Refractive Index : 1.648 – 1.558

    Optical Characteristic : DR, Biaxial negative

    Specific Gravity : 3.20

    Formula : Sr3Na2Zr(CO3)6.3(H2O)

    Crystal System : Triclinic

    Variety/Species : All

    Species/Group : Weloganite

    Birefringence : 0.090

    Dispersion :

    Hardness : 3.5

    Toughness : Poor

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert

    UV Short : Inert

    Pleochroism : None

    Strength : N/A

    Pleochroism Colors : None

    Heat : Sensitive

    Acids : Sensitive

    Light : Stable

    Polish Luster [...]

  • Turquoise

    Natural Turquoise Gemstone

    Refractive Index : 1.650 – 1.610 (1.61 spot)

    Optical Characteristic : AGG

    Specific Gravity : 2.76 (+0.14 – 0.36)

    Formula : CuAI6(PO4)4(OH)8.5H2o +Fe.

    Crystal System : Triclinic

    Variety/Species : All

    Species/Group : Turquoise

    Birefringence : none

    Dispersion : N/A

    Hardness : 5 to 6

    Toughness : poor to good

    Ultrasonic : Never

    Steam : Never

    UV Long : Inert to weak

    UV Short : Inert

    Pleochroism : None

    Strength [...]