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Vivianite
Vivianite

Covellite
Covellite



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Vivianite
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Covellite

Vivianite and Covellite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Pearly
Resinous
1.2 Pleochroism
Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael O’Donoghue
Marked
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references
1.5 Refractive Index
1.560-1.6401.45-2.62
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Hexagonal
1.8 Birefringence
0.054-0.075Not Available
Achroite
0 0.296
1.9 Clarity
Transparent
OpaqueAnthony et al

Vivianite and Covellite Optic Character

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

Vivianite and Covellite Transparency

Similar to their colors, Vivianite and Covellite 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, Vivianite is Transparent while Vivianite is Transparent in appearance.