Caledonite and Foitite Optical Properties

Caledonite

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.818-1.909Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

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

1.8 Birefringence

0.091Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Caledonite and Foitite Optic Character

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

Similar to their colors, Caledonite 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, Caledonite is Transparent while Caledonite is Transparent in appearance.