Andradite Garnet and Lapis lazuli Optical Properties

Andradite Garnet

Lapis lazuli

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous, Greasy

1.2 Pleochroism

Not Available

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

Transparent, Opaque, Transparent to opaque

Opaque

1.5 Refractive Index

1.888-1.8891.500-1.670

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Trigonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent to opaque

Gemstones of the world (2001)

Andradite Garnet and Lapis lazuli Optic Character

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

Similar to their colors, Andradite Garnet 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, Andradite Garnet is Opaque, Transparent and Transparent to opaque while Andradite Garnet is Opaque, Transparent and Transparent to opaque in appearance.