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Forsterite and Almandine Optical Properties


Almandine and Forsterite Optical Properties


Optical Properties

Luster
Vitreous   
Greasy, Vitreous   

Pleochroism
colorless.   
None   

Dispersion
Not Available   
0.03   
15

Transparency
Transparent   
Gemmological Tables (2004) More from other references   

Refractive Index
1.635-1.671   
1.770-1.820   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
cubic   

Birefringence
0.033-0.042   
Not Available   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Forsterite and Almandine Optic Character

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

Similar to their colors, Forsterite and Almandine 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, Forsterite is Transparent while Forsterite is Transparent in appearance.

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