Euclase and Benitoite Optical Properties

Euclase

Benitoite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak: colorless-(greenish) yellow

O = colorless; E = purple

1.3 Dispersion

0.020.04

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Transparent

1.5 Refractive Index

1.650-1.6771.757-1.804

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Hexagonal

1.8 Birefringence

0.019-0.0250.047

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Euclase and Benitoite Optic Character

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

Similar to their colors, Euclase and Benitoite 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, Euclase is Gemmological Tables (2004) More from other references while Euclase is Gemmological Tables (2004) More from other references in appearance.