Opal and Clinochlore Optical Properties

Opal

Clinochlore

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Pearly, Greasy

1.2 Pleochroism

None

Distinct: light yellow-green to light bluE

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent

1.5 Refractive Index

1.37-1.521.571-1.597

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Trigonal

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

Opal and Clinochlore Optic Character

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

Compare Semi Precious Gemstones

Opal Vs Lehsunia

Opal Vs Alexandrite

Opal Vs Amethyst

Opal and Clinochlore Transparency

Similar to their colors, Opal and Clinochlore 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.