Umbalite and Omphacite Optical Properties

Umbalite

Omphacite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

Weak: colorless -- very pale green -- very pale green

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

TransparentGemdat.org, Management Team (2012)

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.730-1.8201.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentGemdat.org

TranslucentAnthony et al

Umbalite and Omphacite Optic Character

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

Similar to their colors, Umbalite and Omphacite 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, Umbalite is Management Team (2012) and TransparentGemdat.org while Umbalite is Management Team (2012) and TransparentGemdat.org in appearance.