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Prehnite
Prehnite

Pyrope
Pyrope



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Prehnite
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Pyrope

Prehnite and Pyrope Optical Properties

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Optical Properties

Luster

Vitreous
Greasy, Vitreous

Pleochroism

-
None

Dispersion

0.010.02
0.005 1
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Transparency

Translucent
-

Refractive Index

1.611-1.6731.720-1.756
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
cubic

Birefringence

0.021-0.033-9999
0 0.296
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Clarity

TranslucentHerve Nicolas Lazzarelli
TransparentUlrich Henn and Claudio C. Milisenda

Prehnite and Pyrope Optic Character

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

Prehnite and Pyrope Transparency

Similar to their colors, Prehnite and Pyrope 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, Prehnite is Translucent while Prehnite is Translucent in appearance.