Astrophyllite and Franklinite Optical Properties

Astrophyllite

Franklinite

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1 Optical Properties

1.1 Luster

Greasy, Pearly

Not Available

1.2 Pleochroism

Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

1.5 Refractive Index

1.678-1.758Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.050Not Available

0 0.296

1.9 Clarity

Translucent

Astrophyllite and Franklinite Optic Character

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

Similar to their colors, Astrophyllite 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.