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Black Opal and Hematite Optical Properties


Hematite and Black Opal Optical Properties


Optical Properties

Luster
Not Available   
Not Available   

Pleochroism
AbsentWalter Schumann   
O = brownish red; E = yellowish red   

Dispersion
None   
Not Available   

Transparency
Transparent, Translucent   
OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references   

Refractive Index
1.370-1.470   
2.690-3.220   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Trigonal   

Birefringence
Not Available   
0.280   

Clarity
Transparent   
OpaqueHerve Nicolas Lazzarelli   

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Black Opal and Hematite Optic Character

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

Similar to their colors, Black Opal and Hematite 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.

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