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Malachite
Malachite

Dumortierite
Dumortierite



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Malachite
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Dumortierite

Malachite and Dumortierite Optical Properties

1 Optical Properties
1.1 Luster
Adamantine, Vitreous, Silky, Fibrous
Vitreous
1.2 Pleochroism
Not Available
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
1.3 Dispersion
NoneNone
Fluorite Optical Properties
0.007 1
1.4 Transparency
Opaque
Translucent, Translucent to opaque
1.5 Refractive Index
1.655-1.9091.669-1.723
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Orthorhombic
1.8 Birefringence
0.2540.011-0.037
Achroite
0 0.296
1.9 Clarity
Gemmological Tables (2004) More from other references
Translucent

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.

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.