Augite and Umbalite Optical Properties

Augite

Umbalite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Not Available

1.2 Pleochroism

Pale green

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent, Translucent

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.671-1.7741.730-1.820

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

TransparentGemdat.org

Augite and Umbalite Optic Character

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

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