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Grandidierite
Grandidierite

Gibbsite
Gibbsite



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Grandidierite
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Gibbsite

Grandidierite and Gibbsite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Pearly
Vitreous, Pearly
1.2 Pleochroism
visible
colorless.
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Not Available
1.5 Refractive Index
1.578-1.639Not Available
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
monoclinic
1.8 Birefringence
0.037-0.039Not Available
Achroite
0 0.296
1.9 Clarity
Gemmological Tables (2004) More from other references
Not Available

Grandidierite and Gibbsite Optic Character

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

Grandidierite and Gibbsite Transparency

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