Archive for the Uvite Category

Uvite

Refractive Index : 1.660 – 1.612

Optical Characteristic : DR, Uniaxial negative

Specific Gravity : 3.06 (- 0.20 – 0.06)

Formula : CaMg3(AI5Mg)BSi6O27(OH)3(OH,f)

Crystal System : Trigonal

Variety/Species : Tourmaline

Species/Group : Tourmaline Group

Birefringence : 0.017 to 0.021

Dispersion : 0.017

Hardness : 7 to 7.5

Toughness : Fair

Ultrasonic : Risky

Steam : Risky

UV Long : Inert to weak

UV Short : Inert to weak

Pleochroism : [...]