Zinnwaldite and Omphacite Optical Properties

Zinnwaldite

Omphacite

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1 Optical Properties

1.1 Luster

Pearly, Vitreous

Vitreous

1.2 Pleochroism

Distinct

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.565-1.6251.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.040-0.050Not Available

0 0.296

1.9 Clarity

Not Available

TranslucentAnthony et al

Zinnwaldite and Omphacite Optic Character

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

Similar to their colors, Zinnwaldite 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, Zinnwaldite is Not Available while Zinnwaldite is Not Available in appearance.