Feldspar and Foitite Optical Properties

Feldspar

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

None

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

1.518-1.570Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic or monoclinic

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

1.8 Birefringence

0.008-0.010Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Feldspar and Foitite Optic Character

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

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