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Staurolite and Nuummite Optical Properties


Nuummite and Staurolite Optical Properties


Optical Properties

Luster
Resinous   
Not Available   

Pleochroism
X = colorless; Y = pale yellow; Z = golden yellow   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Blue Chart Gem Identification (2010) More from other references   
Gemmological Tables (2004) More from other references   

Refractive Index
1.736-1.762   
1.635-1.663   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Not Available   

Birefringence
0.009-0.015   
0.0170-0.230   

Clarity
Blue Chart Gem Identification (2010) More from other references   
Gemmological Tables (2004) More from other references   

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Staurolite and Nuummite Optic Character

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

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Staurolite and Nuummite Transparency

Similar to their colors, Staurolite and Nuummite 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.

Brown Gemstones

Brown Gemstones


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