Gahnospinel and Tourmaline Optical Properties

Gahnospinel

Tourmaline

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

typically moderate to strong

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Transparent, Translucent, Transparent to opaque

1.5 Refractive Index

1.735-1.7901.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Trigonal

1.8 Birefringence

Not Available0.014-0.040

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Gahnospinel and Tourmaline Optic Character

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

Similar to their colors, Gahnospinel and Tourmaline 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.