Astrophyllite and Euclase Optical Properties

Astrophyllite

Euclase

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1 Optical Properties

1.1 Luster

Greasy, Pearly

Vitreous

1.2 Pleochroism

Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow

Weak: colorless-(greenish) yellow

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.678-1.7581.650-1.677

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.0500.019-0.025

0 0.296

1.9 Clarity

Translucent

TransparentUlrich Henn and Claudio C. Milisenda

Astrophyllite and Euclase Optic Character

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

Similar to their colors, Astrophyllite 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.