Norbergite and Watermelon Tourmaline Optical Properties

Norbergite

Watermelon Tourmaline

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Pale yellow very pale yellow colorlessAnthony et al

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.563-1.5931.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

Not Available0.014-0.040

0 0.296

1.9 Clarity

Transparent

TransparentGemdat.org

Norbergite and Watermelon Tourmaline Optic Character

Norbergite and Watermelon Tourmaline optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Norbergite 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 Norbergite 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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Norbergite and Watermelon Tourmaline Transparency

Similar to their colors, Norbergite 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, Norbergite is Transparent while Norbergite is Transparent in appearance.