Variscite and Umbalite Optical Properties

Variscite

Umbalite

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1 Optical Properties

1.1 Luster

Vitreous, Waxy

Not Available

1.2 Pleochroism

MissingWalter Schumann

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Translucent, Opaque . May be translucent when backlit on the edges.

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.560-1.5941.730-1.820

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.031Not Available

0 0.296

1.9 Clarity

Translucent

TransparentGemdat.org

Variscite and Umbalite Optic Character

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

Similar to their colors, Variscite 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, Variscite is Opaque . May be translucent when backlit on the edges. and Translucent while Variscite is Opaque . May be translucent when backlit on the edges. and Translucent in appearance.