Willemite and Star Sapphire Optical Properties

Willemite

Star Sapphire

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Not Available

1.2 Pleochroism

NilArthur Thomas

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

1.5 Refractive Index

1.687-1.7231.758-1.780

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

0.028-0.0300.007-0.010

0 0.296

1.9 Clarity

Transparent

Willemite and Star Sapphire Optic Character

Willemite and Star Sapphire optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Willemite and Star Sapphire 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 Willemite and Star Sapphire 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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Willemite and Star Sapphire Transparency

Similar to their colors, Willemite and Star Sapphire 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, Willemite is Translucent and Transparent while Willemite is Translucent and Transparent in appearance.