Allanite and Hercynite Optical Properties

Allanite

Hercynite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Translucent

1.5 Refractive Index

11.80-1.83

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

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

1.8 Birefringence

0.013-0.036Not Available

0 0.296

1.9 Clarity

Not Available

Translucent

Allanite and Hercynite Optic Character

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

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