Foitite and Sanidine Optical Properties

Foitite

Sanidine

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Strong: pale lavender dark blueAnthony et al

WeakMichael OâDonoghue

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TranslucentAnthony et al, Translucent

Transparent

1.5 Refractive Index

Not Available1.518-1.536

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Not Available

1.8 Birefringence

Not Available0.005-0.008

0 0.296

1.9 Clarity

TranslucentAnthony et al

Transparent

Foitite and Sanidine Optic Character

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

Similar to their colors, Foitite and Sanidine 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, Foitite is Translucent and TranslucentAnthony et al while Foitite is Translucent and TranslucentAnthony et al in appearance.