Topaz and Omphacite Optical Properties

Topaz

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak

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

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.606-1.6441.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.008-0.011Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentAnthony et al

Topaz and Omphacite Optic Character

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

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