Apophyllite and Foitite Optical Properties

Apophyllite

Foitite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous

1.2 Pleochroism

Dichroic (colorless)

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.530-1.543Not Available

1 3.25

1.6 Optic Character

Uniaxial/-

Not Available

1.7 Crystal System

tetragonal

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

1.8 Birefringence

0.000-0.003Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Apophyllite and Foitite Optic Character

Apophyllite and Foitite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Apophyllite 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 Apophyllite 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. Apophyllite has Uniaxial/- character.

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Apophyllite and Foitite Transparency

Similar to their colors, Apophyllite 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, Apophyllite is Translucent and Transparent while Apophyllite is Translucent and Transparent in appearance.