Foitite and Amblygonite Optical Properties

Foitite

Amblygonite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Pearly

1.2 Pleochroism

Strong: pale lavender dark blueAnthony et al

weak to none

1.3 Dispersion

NA0.01

0.007 1

1.4 Transparency

TranslucentAnthony et al, Translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

Not Available1.578-1.646

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

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

Triclinic

1.8 Birefringence

Not Available0.020-0.030

0 0.296

1.9 Clarity

TranslucentAnthony et al

TransparentUlrich Henn and Claudio C. Milisenda

Foitite and Amblygonite Optic Character

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

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Foitite and Amblygonite Transparency

Similar to their colors, Foitite and Amblygonite 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.