Sunstone and Lapis lazuli Optical Properties

Sunstone

Lapis lazuli

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Greasy

1.2 Pleochroism

Weak or absentWalter Schumann

AbsentWalter Schumann

1.3 Dispersion

NoneNone

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Opaque

1.5 Refractive Index

1.53-1.551.500-1.670

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

Trigonal

1.8 Birefringence

0.007-0.010Not Available

0 0.296

1.9 Clarity

Transparent to translucent

Gemstones of the world (2001)

Sunstone and Lapis lazuli Optic Character

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

Similar to their colors, Sunstone and Lapis lazuli 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.