Friedelite and Foitite Optical Properties

Friedelite

Foitite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

NilArthur Thomas

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

1.627-1.663Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

1.8 Birefringence

0.032-0.035Not Available

0 0.296

1.9 Clarity

Translucent

TranslucentAnthony et al

Friedelite and Foitite Optic Character

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

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