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Fluorapatite and Grandidierite Optical Properties


Grandidierite and Fluorapatite Optical Properties


Optical Properties

Luster
Vitreous, Resinous   
Vitreous, Pearly   

Pleochroism
Weak to strong if coloreD   
visible   

Dispersion
Not Available   
Not Available   

Transparency
Transparent   
Gemmological Tables (2004) More from other references   

Refractive Index
1.631-1.650   
1.578-1.639   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Orthorhombic   

Birefringence
Not Available   
0.037-0.039   

Clarity
Transparent   
Gemmological Tables (2004) More from other references   

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Fluorapatite and Grandidierite Optic Character

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

Similar to their colors, Fluorapatite 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, Fluorapatite is Transparent while Fluorapatite is Transparent in appearance.

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