Fire Opal and Foitite Optical Properties

Fire 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

Transparent, Translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.370-1.470Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Amorphous

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

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Fire Opal and Foitite Optic Character

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

Fire Opal Vs Hexagonite

Fire Opal Vs Hackmanite

Fire Opal and Foitite Transparency

Similar to their colors, Fire 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, Fire Opal is Translucent and Transparent while Fire Opal is Translucent and Transparent in appearance.