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Gahnospinel
Gahnospinel

Foitite
Foitite



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Gahnospinel and Foitite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
AbsentWalter Schumann
Strong: pale lavender dark blueAnthony et al
1.3 Dispersion
Albite Optical ..
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Fluorite Optical Properties
1.4 Transparency
Gemmological Tables (2004)
TranslucentAnthony et al, Translucent
1.5 Refractive Index
1.735-1.790
Not Available
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Isometric
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
1.8 Birefringence
Not Available
Not Available
1.9 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
TranslucentAnthony et al

Gahnospinel and Foitite Optic Character

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

Gahnospinel and Foitite Transparency

Similar to their colors, Gahnospinel 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, Gahnospinel is Gemmological Tables (2004) while Gahnospinel is Gemmological Tables (2004) in appearance.