Gahnospinel and Dumortierite Optical Properties

Gahnospinel

Dumortierite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Translucent, Translucent to opaque

1.5 Refractive Index

1.735-1.7901.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Orthorhombic

1.8 Birefringence

Not Available0.011-0.037

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Translucent

Gahnospinel and Dumortierite Optic Character

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

Similar to their colors, Gahnospinel and Dumortierite 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.