Hurlbutite and Foitite Optical Properties

Hurlbutite

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

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

1.595-1.604Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

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

1.8 Birefringence

0.009Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Hurlbutite and Foitite Optic Character

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

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