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Omphacite
Omphacite

Cordierite Iolite
Cordierite Iolite



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Omphacite
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Cordierite Iolite

Omphacite and Cordierite Iolite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Weak: colorless -- very pale green -- very pale green
Strong trichroism: colorless to yellowish
1.3 Dispersion
NA0.02
Fluorite Optical Properties
0.007 1
1.4 Transparency
TranslucentAnthony et al, Handbook of mineralogy (2001)
Transparent
1.5 Refractive Index
1.662-1.7231.542-1.578
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Biaxial/+
1.7 Crystal System
Not Available
Not Available
1.8 Birefringence
Not Available0.008-0.012
Achroite
0 0.296
1.9 Clarity
TranslucentAnthony et al
Transparent

Omphacite and Cordierite Iolite Optic Character

Omphacite and Cordierite Iolite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Omphacite and Cordierite Iolite 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 Omphacite and Cordierite Iolite 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 Iolite has Biaxial/+ character.

Omphacite and Cordierite Iolite Transparency

Similar to their colors, Omphacite and Cordierite Iolite 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, Omphacite is Handbook of mineralogy (2001) and TranslucentAnthony et al while Omphacite is Handbook of mineralogy (2001) and TranslucentAnthony et al in appearance.