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Tourmaline
Tourmaline

Opal
Opal



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Tourmaline
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Opal

Tourmaline and Opal Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Pearly
1.2 Pleochroism
typically moderate to strong
None
1.3 Dispersion
0.02None
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to opaque
Transparent, Translucent, Transparent to translucent
1.5 Refractive Index
1.614-1.6661.37-1.52
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Trigonal
1.8 Birefringence
0.014-0.040Not Available
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Tourmaline and Opal Optic Character

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

Tourmaline and Opal Transparency

Similar to their colors, Tourmaline and Opal 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.