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Bastnasite
Bastnasite

Epidote
Epidote



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Bastnasite
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Epidote

Bastnasite and Epidote Optical Properties

Optical Properties

Luster

Vitreous, Greasy, Pearly
Vitreous, Resinous

Pleochroism

Faint
Strong

Dispersion

0.020.03
0.005 1
👆🏻

Transparency

-
-

Refractive Index

1.717-1.7221.729-1.768
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Hexagonal
monoclinic

Birefringence

0.1000.019-0.046
0 0.296
👆🏻

Clarity

TransparentUlrich Henn and Claudio C. Milisenda
TransparentUlrich Henn and Claudio C. Milisenda

Bastnasite and Epidote Optic Character

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

Bastnasite and Epidote Transparency

Similar to their colors, Bastnasite and Epidote 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, Bastnasite is while Bastnasite is in appearance.