Riebeckite and Hercynite Optical Properties

Riebeckite

Hercynite

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1 Optical Properties

1.1 Luster

Vitreous, Silky

Vitreous

1.2 Pleochroism

X = blue

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Translucent

1.5 Refractive Index

1.680-1.6981.80-1.83

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

1.8 Birefringence

0.005-0.008Not Available

0 0.296

1.9 Clarity

Not Available

Translucent

Riebeckite and Hercynite Optic Character

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

Similar to their colors, Riebeckite and Hercynite 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, Riebeckite is Not Available while Riebeckite is Not Available in appearance.