Sunstone and Euclase Optical Properties

Sunstone

Euclase

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Optical Properties

Luster

Vitreous

Pleochroism

Weak or absentWalter Schumann

Weak: colorless-(greenish) yellow

Dispersion

0.010.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.53-1.551.650-1.677

1 3.25

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Optic Character

Crystal System

Triclinic

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

Birefringence

0.007-0.0100.019-0.025

0 0.296

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Clarity

Transparent to translucent

TransparentUlrich Henn and Claudio C. Milisenda

Sunstone and Euclase Optic Character

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

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