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Cordierite
Cordierite

Almandine
Almandine



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Cordierite
X
Almandine

Cordierite and Almandine Optical Properties

1 Optical Properties
1.1 Luster
Greasy, Vitreous
Greasy, Vitreous
1.2 Pleochroism
X = pale yellow
None
1.3 Dispersion
NA0.03
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
Gemmological Tables (2004) More from other references
1.5 Refractive Index
Not Available1.770-1.820
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
cubic
1.8 Birefringence
Not AvailableNot Available
Achroite
0 0.296
1.9 Clarity
Not Available
TransparentUlrich Henn and Claudio C. Milisenda

Cordierite and Almandine Optic Character

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

Cordierite and Almandine Transparency

Similar to their colors, Cordierite 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, Cordierite is Not Available while Cordierite is Not Available in appearance.