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Malachite and Dumortierite Optical Properties


Dumortierite and Malachite Optical Properties


Optical Properties

Luster
Adamantine, Vitreous, Silky, Fibrous   
Vitreous   

Pleochroism
Not Available   
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue   

Dispersion
None   
None   

Transparency
Opaque   
Translucent, Translucent to opaque   

Refractive Index
1.655-1.909   
1.669-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Orthorhombic   

Birefringence
0.254   
0.011-0.037   

Clarity
Gemmological Tables (2004) More from other references   
Translucent   

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Malachite and Dumortierite Optic Character

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

Similar to their colors, Malachite and Dumortierite 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, Malachite is Opaque while Malachite is Opaque in appearance.

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