Norbergite and Stibiotantalite Optical Properties

Norbergite

Stibiotantalite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

Pale yellow very pale yellow colorlessAnthony et al

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.563-1.5932.37-2.45

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

Not Available0.08

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Norbergite and Stibiotantalite Optic Character

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

Similar to their colors, Norbergite and Stibiotantalite 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, Norbergite is Transparent while Norbergite is Transparent in appearance.