Dravite and Franklinite Optical Properties

Dravite

Franklinite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Very strong: pale yellow colorless

Not Available

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

Translucent

1.5 Refractive Index

1.614-1.666Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

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

1.8 Birefringence

0.014-0.032Not Available

0 0.296

1.9 Clarity

Transparent

Translucent

Dravite and Franklinite Optic Character

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

Similar to their colors, Dravite 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, Dravite is Transparent while Dravite is Transparent in appearance.