Gahnospinel and Mellite Optical Properties

Gahnospinel

Mellite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Weak: yellowish brown yellowAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.735-1.7901.509-1.541

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Not Available

1.8 Birefringence

Not Available0.030

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Gahnospinel and Mellite Optic Character

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

Similar to their colors, Gahnospinel and Mellite 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.