Tourmaline and Dioptase Optical Properties

Tourmaline

Dioptase

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

typically moderate to strong

Weak; dark emerald green

1.3 Dispersion

0.020.04

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

TranslucentHerve Nicolas Lazzarelli

1.5 Refractive Index

1.614-1.6661.644-1.720

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

1.8 Birefringence

0.014-0.0400.051-0.053

0 0.296

1.9 Clarity

Transparent

TranslucentHerve Nicolas Lazzarelli

Tourmaline and Dioptase Optic Character

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

Similar to their colors, Tourmaline and Dioptase 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.