Tanzanite and Phosgenite Optical Properties

Tanzanite

Phosgenite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

Present

Weakly pleochroic with O reddish and E greenish in thick sections.

1.3 Dispersion

0.03NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.685-1.7072.117-2.145

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

tetragonal

1.8 Birefringence

0.006-0.0180.027

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Tanzanite and Phosgenite Optic Character

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

Similar to their colors, Tanzanite and Phosgenite 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, Tanzanite is Translucent, Transparent and Transparent to translucent while Tanzanite is Translucent, Transparent and Transparent to translucent in appearance.