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Howlite and Danburite Optical Properties


Danburite and Howlite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Greasy   

Pleochroism
NilArthur Thomas   
Weak: pale yellow yellow   

Dispersion
Not Available   
0.02   
22

Transparency
Gemmological Tables (2004) More from other references   
Gemmological Tables (2004) More from other references   

Refractive Index
1.583-1.608   
1.627-1.639   

Optic Character
Not Available   
Biaxial/+   

Crystal System
monoclinic   
Orthorhombic   

Birefringence
0.019   
0.006   

Clarity
Gemmological Tables (2004) More from other references   
TransparentUlrich Henn and Claudio C. Milisenda   

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Howlite and Danburite Optic Character

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

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Howlite and Danburite Transparency

Similar to their colors, Howlite and Danburite 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, Howlite is Gemmological Tables (2004) More from other references while Howlite is Gemmological Tables (2004) More from other references in appearance.

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