Benitoite and Euclase Optical Properties

Benitoite

Euclase

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

O = colorless; E = purple

Weak: colorless-(greenish) yellow

1.3 Dispersion

0.040.02

0.007 1

1.4 Transparency

Transparent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.757-1.8041.650-1.677

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

1.8 Birefringence

0.0470.019-0.025

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Benitoite and Euclase Optic Character

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

Similar to their colors, Benitoite and Euclase 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, Benitoite is Transparent while Benitoite is Transparent in appearance.