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Gibbsite
Gibbsite

Sellaite
Sellaite



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Gibbsite
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Sellaite

Gibbsite and Sellaite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Pearly
Vitreous
1.2 Pleochroism
colorless.
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
Transparent
1.5 Refractive Index
Not Available1.378-1.390
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
tetragonal
1.8 Birefringence
Not Available0.012
Achroite
0 0.296
1.9 Clarity
Not Available
Transparent

Gibbsite and Sellaite Optic Character

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

Gibbsite and Sellaite Transparency

Similar to their colors, Gibbsite and Sellaite 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, Gibbsite is Not Available while Gibbsite is Not Available in appearance.