Sunstone and Umbalite Optical Properties

Sunstone

Umbalite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Weak or absentWalter Schumann

Not Available

1.3 Dispersion

None0.02

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.53-1.551.730-1.820

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

Not Available

1.8 Birefringence

0.007-0.010Not Available

0 0.296

1.9 Clarity

Transparent to translucent

TransparentGemdat.org

Sunstone and Umbalite Optic Character

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

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