Allanite and Manganotantalite Optical Properties

Allanite

Manganotantalite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

Not Available

Sometimes strongArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

TransparentWalter Schumann, Gemstones of the world (2001) More from other references

1.5 Refractive Index

12.19-2.34

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

0.013-0.0360.015

0 0.296

1.9 Clarity

Not Available

TransparentWalter Schumann

Allanite and Manganotantalite Optic Character

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

Similar to their colors, Allanite and Manganotantalite 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.