Allanite and Cacoxenite Optical Properties

Allanite

Cacoxenite

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1 Optical Properties

1.1 Luster

Not Available

Silky

1.2 Pleochroism

Not Available

visible: O = Pale yellow E = Canary yellow to yellow orange

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

1.5 Refractive Index

11.575-1.585

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Hexagonal

1.8 Birefringence

0.013-0.036Not Available

0 0.296

1.9 Clarity

Not Available

Allanite and Cacoxenite Optic Character

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

Similar to their colors, Allanite and Cacoxenite 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.