Mellite and Tourmaline Optical Properties

Mellite

Tourmaline

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak: yellowish brown yellowAnthony et al

typically moderate to strong

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Transparent, Translucent, Transparent to opaque

1.5 Refractive Index

1.509-1.5411.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Trigonal

1.8 Birefringence

0.0300.014-0.040

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Mellite and Tourmaline Optic Character

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

Similar to their colors, Mellite and 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, Mellite is Gemmological Tables (2004) More from other references while Mellite is Gemmological Tables (2004) More from other references in appearance.