Corundum and Rosasite Optical Properties

Corundum

Rosasite

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1 Optical Properties

1.1 Luster

Adamantine, Vitreous

Silky, Vitreous

1.2 Pleochroism

None

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

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent

Not Available

1.5 Refractive Index

1.758-1.7801.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

monoclinic

1.8 Birefringence

0.007-0.0100.139-0.143

0 0.296

1.9 Clarity

Gemmological Tables (2004) More from other references

Not Available

Corundum and Rosasite Optic Character

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

Similar to their colors, Corundum 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, Corundum is Translucent and Transparent while Corundum is Translucent and Transparent in appearance.