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Demantoid and Staurolite Optical Properties


Staurolite and Demantoid Optical Properties


Optical Properties

Luster
Adamantine   
Resinous   

Pleochroism
None   
X = colorless; Y = pale yellow; Z = golden yellow   

Dispersion
Not Available   
Not Available   

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

Refractive Index
1.880-1.890   
1.736-1.762   

Optic Character
Not Available   
Not Available   

Crystal System
cubic   
monoclinic   

Birefringence
Not Available   
0.009-0.015   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Blue Chart Gem Identification (2010) More from other references   

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Demantoid and Staurolite Optic Character

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

Similar to their colors, Demantoid and Staurolite 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.

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