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Herderite and Hematite Optical Properties


Hematite and Herderite Optical Properties


Optical Properties

Luster
Vitreous   
Not Available   

Pleochroism
Not Available   
O = brownish red; E = yellowish red   

Dispersion
Not Available   
Not Available   

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

Refractive Index
1.587-1.642   
2.690-3.220   

Optic Character
Biaxial/+   
Not Available   

Crystal System
monoclinic   
Trigonal   

Birefringence
0.028-0.032   
0.280   

Clarity
Transparent   
OpaqueHerve Nicolas Lazzarelli   

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Herderite and Hematite Optic Character

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

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Herderite and Hematite Transparency

Similar to their colors, Herderite 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, Herderite is Transparent while Herderite is Transparent in appearance.

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