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Phenakite
Phenakite

Vivianite
Vivianite



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Phenakite
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Vivianite

Phenakite and Vivianite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Pearly
1.2 Pleochroism
Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli
Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael O’Donoghue
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Transparent
1.5 Refractive Index
1.650-1.6951.560-1.640
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.1 Crystal System
Trigonal
Not Available
1.4 Birefringence
0.0160.054-0.075
Achroite
0 0.296
2.5 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent

Phenakite and Vivianite Optic Character

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

Phenakite and Vivianite Transparency

Similar to their colors, Phenakite and Vivianite 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, Phenakite is Gemmological Tables (2004) More from other references while Phenakite is Gemmological Tables (2004) More from other references in appearance.