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Iolite
Iolite

Erythrite
Erythrite



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Iolite
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Erythrite

Iolite and Erythrite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Subadamantine, Pearly
1.2 Pleochroism
Not Available
Visible: X = pale pinkish to pale rose; Y = pale violet to pale violet-rose; Z = deep red
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to translucent
Not Available
1.5 Refractive Index
1.52-1.561.626-1.629
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
monoclinic
1.8 Birefringence
Not AvailableNot Available
Achroite
0 0.296
1.9 Clarity
Transparent to translucent
Not Available

Iolite and Erythrite Optic Character

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

Iolite and Erythrite Transparency

Similar to their colors, Iolite and Erythrite 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, Iolite is Translucent, Transparent and Transparent to translucent while Iolite is Translucent, Transparent and Transparent to translucent in appearance.