Agate Opal and Foitite Optical Properties

Agate Opal

Foitite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.37-1.52Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

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

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Translucent

TranslucentAnthony et al

Agate Opal and Foitite Optic Character

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

Similar to their colors, Agate Opal 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, Agate Opal is Translucent while Agate Opal is Translucent in appearance.