Vivianite and Watermelon Tourmaline Optical Properties

Vivianite

Watermelon Tourmaline

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous

1.2 Pleochroism

Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael OâDonoghue

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.560-1.6401.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

0.054-0.0750.014-0.040

0 0.296

1.9 Clarity

Transparent

TransparentGemdat.org

Vivianite and Watermelon Tourmaline Optic Character

Vivianite and Watermelon Tourmaline optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Vivianite and Watermelon Tourmaline Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Vivianite and Watermelon Tourmaline optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Vivianite and Watermelon Tourmaline Transparency

Similar to their colors, Vivianite and Watermelon Tourmaline transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Vivianite is Transparent while Vivianite is Transparent in appearance.