Allanite and Rosasite Optical Properties

Allanite

Rosasite

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1 Optical Properties

1.1 Luster

Not Available

Silky, Vitreous

1.2 Pleochroism

Not Available

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

1.5 Refractive Index

11.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

monoclinic

1.8 Birefringence

0.013-0.0360.139-0.143

0 0.296

1.9 Clarity

Not Available

Allanite and Rosasite Optic Character

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

Similar to their colors, Allanite and Rosasite 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.