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Pollucite
Pollucite

Covellite
Covellite



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Pollucite
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Covellite

Pollucite and Covellite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Greasy
Resinous
1.2 Pleochroism
Not Available
Marked
1.3 Dispersion
0.01NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references
1.5 Refractive Index
1.517-1.5251.45-2.62
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Isometric
Hexagonal
1.8 Birefringence
Not AvailableNot Available
Achroite
0 0.296
1.9 Clarity
Transparent
OpaqueAnthony et al

Pollucite and Covellite Optic Character

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

Pollucite and Covellite Transparency

Similar to their colors, Pollucite 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, Pollucite is Translucent and Transparent while Pollucite is Translucent and Transparent in appearance.