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Black Opal
Black Opal

Herderite
Herderite



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Black Opal
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Herderite

Black Opal and Herderite Optical Properties

1 Optical Properties
1.1 Luster
Not Available
Vitreous
1.2 Pleochroism
AbsentWalter Schumann
Not Available
1.3 Dispersion
NoneNA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Transparent
1.5 Refractive Index
1.370-1.4701.587-1.642
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Biaxial/+
1.7 Crystal System
Not Available
monoclinic
1.8 Birefringence
Not Available0.028-0.032
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Black Opal and Herderite Optic Character

Black Opal and Herderite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Black Opal and Herderite 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 Black Opal and Herderite 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. Herderite has Biaxial/+ character.

Black Opal and Herderite Transparency

Similar to their colors, Black Opal and Herderite 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, Black Opal is Translucent and Transparent while Black Opal is Translucent and Transparent in appearance.