Precious Opal and Rosasite Optical Properties

Precious Opal

Rosasite

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1 Optical Properties

1.1 Luster

Not Available

Silky, Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Transparent, Translucent

Not Available

1.5 Refractive Index

1.370-1.4701.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

monoclinic

1.8 Birefringence

Not Available0.139-0.143

0 0.296

1.9 Clarity

Transparent

Not Available

Precious Opal and Rosasite Optic Character

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

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Precious Opal Vs Sardonyx

Precious Opal Vs Sard

Precious Opal Vs Sapphire

Precious Opal and Rosasite Transparency

Similar to their colors, Precious Opal and Rosasite 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, Precious Opal is Translucent and Transparent while Precious Opal is Translucent and Transparent in appearance.