Gahnospinel and Norbergite Optical Properties

Gahnospinel

Norbergite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Pale yellow very pale yellow colorlessAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Transparent

1.5 Refractive Index

1.735-1.7901.563-1.593

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Gahnospinel and Norbergite Optic Character

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

Similar to their colors, Gahnospinel and Norbergite 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.