Franklinite and Astrophyllite Optical Properties

Franklinite

Astrophyllite

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1 Optical Properties

1.1 Luster

Not Available

Greasy, Pearly

1.2 Pleochroism

Not Available

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

1.5 Refractive Index

Not Available1.678-1.758

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Triclinic

1.8 Birefringence

Not Available0.050

0 0.296

1.9 Clarity

Translucent

Franklinite and Astrophyllite Optic Character

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

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