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Iolite
Iolite

Ludlamite
Ludlamite



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Iolite
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Ludlamite

Iolite and Ludlamite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Pearly
1.2 Pleochroism
Not Available
NilArthur Thomas
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to translucent
Gemmological Tables (2004) More from other references
1.5 Refractive Index
1.52-1.561.653-1.693
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
monoclinic
1.8 Birefringence
Not Available0.038-0.044
Achroite
0 0.296
1.9 Clarity
Transparent to translucent
TransparentUlrich Henn and Claudio C. Milisenda

Iolite and Ludlamite Optic Character

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

Similar to their colors, Iolite and Ludlamite 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.