Turquoise and Foitite Optical Properties

Turquoise

Foitite

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1 Optical Properties

1.1 Luster

Waxy

Vitreous

1.2 Pleochroism

Weak

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Opaque

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.610-1.650Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.040Not Available

0 0.296

1.9 Clarity

Translucent

TranslucentAnthony et al

Turquoise and Foitite Optic Character

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

Similar to their colors, Turquoise 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, Turquoise is Opaque and Translucent while Turquoise is Opaque and Translucent in appearance.