Gahnospinel and Manganotantalite Optical Properties

Gahnospinel

Manganotantalite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

AbsentWalter Schumann

Sometimes strongArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

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

1.5 Refractive Index

1.735-1.7902.19-2.34

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Not Available

1.8 Birefringence

Not Available0.015

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TransparentWalter Schumann

Gahnospinel and Manganotantalite Optic Character

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

Similar to their colors, Gahnospinel 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, Gahnospinel is Gemmological Tables (2004) while Gahnospinel is Gemmological Tables (2004) in appearance.