Peridot and Yttrium Aluminium Garnet Optical Properties

Peridot

Yttrium Aluminium Garnet

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Not Available

1.2 Pleochroism

Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli

Not Available

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

Gemmological Tables (2004)

1.5 Refractive Index

1.64-1.691.833

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.036Not Available

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Peridot and Yttrium Aluminium Garnet Optic Character

Peridot and Yttrium Aluminium Garnet optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Peridot and Yttrium Aluminium Garnet 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 Peridot and Yttrium Aluminium Garnet 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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Peridot and Yttrium Aluminium Garnet Transparency

Similar to their colors, Peridot and Yttrium Aluminium Garnet 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, Peridot is Transparent while Peridot is Transparent in appearance.