Opal and Apophyllite Optical Properties

Opal

Apophyllite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

1.2 Pleochroism

None

Dichroic (colorless)

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent, Translucent

1.5 Refractive Index

1.37-1.521.530-1.543

1 3.25

1.6 Optic Character

Not Available

Uniaxial/-

1.7 Crystal System

Trigonal

tetragonal

1.8 Birefringence

Not Available0.000-0.003

0 0.296

1.9 Clarity

Transparent

Opal and Apophyllite Optic Character

Opal and Apophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Opal and Apophyllite 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 Apophyllite 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. Apophyllite has Uniaxial/- character.

Compare Semi Precious Gemstones

Opal Vs Lehsunia

Opal Vs Amethyst

Opal Vs Alexandrite

Opal and Apophyllite Transparency

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