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Malachite and Zoisite Optical Properties


Zoisite and Malachite Optical Properties


Optical Properties

Luster
Adamantine, Vitreous, Silky, Fibrous   
Vitreous   

Pleochroism
Not Available   
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green   

Dispersion
None   
0.02   
19

Transparency
Opaque   
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.   

Refractive Index
1.655-1.909   
1.685-1.707   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Orthorhombic   

Birefringence
0.254   
0.006-0.018   

Clarity
Gemmological Tables (2004) More from other references   
Transparent   

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Malachite and Zoisite Optic Character

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

Similar to their colors, Malachite and Zoisite 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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