Astrophyllite and Foitite Optical Properties

Astrophyllite

Foitite

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1 Optical Properties

1.1 Luster

Greasy, Pearly

Vitreous

1.2 Pleochroism

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

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.678-1.758Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.050Not Available

0 0.296

1.9 Clarity

Translucent

TranslucentAnthony et al

Astrophyllite and Foitite Optic Character

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

Similar to their colors, Astrophyllite and Foitite 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.