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Mottramite and Grandidierite Optical Properties


Grandidierite and Mottramite Optical Properties


Optical Properties

Luster
Greasy   
Vitreous, Pearly   

Pleochroism
Visible X=Y= canary yellow to greenish yellow   
visible   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Gemmological Tables (2004) More from other references   

Refractive Index
2.170   
1.578-1.639   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.150   
0.037-0.039   

Clarity
Not Available   
Gemmological Tables (2004) More from other references   

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Mottramite and Grandidierite Optic Character

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

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Mottramite and Grandidierite Transparency

Similar to their colors, Mottramite and Grandidierite 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, Mottramite is Not Available while Mottramite is Not Available in appearance.

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Brown Gemstones


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