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Unakite and Mellite Optical Properties


Mellite and Unakite Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
Not Available   
Weak: yellowish brown yellowAnthony et al   

Dispersion
Not Available   
Not Available   

Transparency
Gemstones of the world (2001)   
Gemmological Tables (2004) More from other references   

Refractive Index
1.525   
1.509-1.541   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Not Available   

Birefringence
Not Available   
0.030   

Clarity
Gemstones of the world (2001)   
TransparentUlrich Henn and Claudio C. Milisenda   

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Unakite and Mellite Optic Character

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

Similar to their colors, Unakite and Mellite 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, Unakite is Gemstones of the world (2001) while Unakite is Gemstones of the world (2001) in appearance.

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