Tourmaline and Omphacite Optical Properties

Tourmaline

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

typically moderate to strong

Weak: colorless -- very pale green -- very pale green

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.614-1.6661.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

0.014-0.040Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Tourmaline and Omphacite Optic Character

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

Similar to their colors, Tourmaline and Omphacite 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, Tourmaline is Translucent, Transparent and Transparent to opaque while Tourmaline is Translucent, Transparent and Transparent to opaque in appearance.