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Staurolite and Cordierite Iolite Optical Properties


Cordierite Iolite and Staurolite Optical Properties


Optical Properties

Luster
Resinous   
Vitreous   

Pleochroism
X = colorless; Y = pale yellow; Z = golden yellow   
Strong trichroism: colorless to yellowish   

Dispersion
Not Available   
0.02   
22

Transparency
Blue Chart Gem Identification (2010) More from other references   
Transparent   

Refractive Index
1.736-1.762   
1.542-1.578   

Optic Character
Not Available   
Biaxial/+   

Crystal System
monoclinic   
Not Available   

Birefringence
0.009-0.015   
0.008-0.012   

Clarity
Blue Chart Gem Identification (2010) More from other references   
Transparent   

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Staurolite and Cordierite Iolite Optic Character

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

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Staurolite and Cordierite Iolite Transparency

Similar to their colors, Staurolite 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, Staurolite is Blue Chart Gem Identification (2010) More from other references while Staurolite is Blue Chart Gem Identification (2010) More from other references in appearance.

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Brown Gemstones


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