Dioptase and Foitite Optical Properties

Dioptase

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak; dark emerald green

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

0.04NA

0.007 1

1.4 Transparency

TranslucentHerve Nicolas Lazzarelli

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.644-1.720Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

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

1.8 Birefringence

0.051-0.053Not Available

0 0.296

1.9 Clarity

TranslucentHerve Nicolas Lazzarelli

TranslucentAnthony et al

Dioptase and Foitite Optic Character

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

Similar to their colors, Dioptase 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, Dioptase is TranslucentHerve Nicolas Lazzarelli while Dioptase is TranslucentHerve Nicolas Lazzarelli in appearance.