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Hurlbutite and Umbalite Optical Properties


Umbalite and Hurlbutite Optical Properties


Optical Properties

Luster
Vitreous   
Not Available   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
0.02   
16

Transparency
Transparent   
TransparentGemdat.org, Management Team (2012)   

Refractive Index
1.595-1.604   
1.730-1.820   

Optic Character
Not Available   
Not Available   

Crystal System
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a   
Not Available   

Birefringence
0.009   
Not Available   

Clarity
Transparent   
TransparentGemdat.org   

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Hurlbutite and Umbalite Optic Character

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

Similar to their colors, Hurlbutite and Umbalite 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, Hurlbutite is Transparent while Hurlbutite is Transparent in appearance.

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