Corundum and Augite Optical Properties

Corundum

Augite

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1 Optical Properties

1.1 Luster

Adamantine, Vitreous

Vitreous, Resinous

1.2 Pleochroism

None

Pale green

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent

1.5 Refractive Index

1.758-1.7801.671-1.774

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

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

1.8 Birefringence

0.007-0.010Not Available

0 0.296

1.9 Clarity

Gemmological Tables (2004) More from other references

Transparent

Corundum and Augite Optic Character

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

Similar to their colors, Corundum and Augite 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.