Narsarsukite and Foitite Optical Properties

Narsarsukite

Foitite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous

1.2 Pleochroism

Weak; O = colorless to yellow; E = colorless to honey-yellow

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

1.610-1.647Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

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

1.8 Birefringence

0.021Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Narsarsukite and Foitite Optic Character

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

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