Powellite and Foitite Optical Properties

Powellite

Foitite

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1 Optical Properties

1.1 Luster

Greasy, Subadamantine

Vitreous

1.2 Pleochroism

In deeply colored specimens: blue greenAnthony et al

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

1.974-1.984Not 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

Transparent

TranslucentAnthony et al

Powellite and Foitite Optic Character

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

Compare Blue Gemstones

Powellite Vs Rubellite

Powellite Vs Sanidine

Powellite Vs Rock Crystal

Powellite and Foitite Transparency

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