Titanite Sphene and Alexandrite Optical Properties

Titanite Sphene

Alexandrite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Green stones strong trichroism: typically colorless greenish yellow brownish to yellow;

Not Available

1.3 Dispersion

0.05NA

0.007 1

1.4 Transparency

Transparent, Translucent

Transparent, Transparent to nearly opaque

1.5 Refractive Index

1.843-2.1101.739-1.770

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

0.100-0.1920.007-0.010

0 0.296

1.9 Clarity

Transparent

Titanite Sphene and Alexandrite Optic Character

Titanite Sphene and Alexandrite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Titanite Sphene and Alexandrite 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 Titanite Sphene and Alexandrite 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. Alexandrite has Biaxial/+ character.

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Titanite Sphene and Alexandrite Transparency

Similar to their colors, Titanite Sphene and Alexandrite 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, Titanite Sphene is Translucent and Transparent while Titanite Sphene is Translucent and Transparent in appearance.