Peridot and Franklinite Optical Properties

Peridot

Franklinite

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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

Translucent

1.5 Refractive Index

1.64-1.69Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

1.8 Birefringence

0.036Not Available

0 0.296

1.9 Clarity

Transparent

Translucent

Peridot and Franklinite Optic Character

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

Similar to their colors, Peridot and Franklinite 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.