Opal and Prehnite Optical Properties

Opal

Prehnite

Add ⊕

Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

Vitreous, Pearly

None

0.01

Transparent, Translucent, Transparent to translucent

1.37-1.52

Trigonal

-9999

Transparent

Vitreous

0.01

Translucent

1.611-1.673

Orthorhombic

0.021-0.033

TranslucentHerve Nicolas Lazzarelli

Opal and Prehnite Optic Character

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

Compare Semi Precious Gemstones

Opal Vs Schorlomite

Opal Vs Simpsonite

Opal Vs Spessartine

Opal and Prehnite Transparency

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