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Howlite and Thulite Optical Properties


Thulite and Howlite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
NilArthur Thomas   
Present   

Dispersion
Not Available   
Not Available   

Transparency
Gemmological Tables (2004) More from other references   
Opaque, Translucent, Opaque . May be translucent in thin backlit sections.   

Refractive Index
1.583-1.608   
1.695   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Orthorhombic   

Birefringence
0.019   
0.006-0.018   

Clarity
Gemmological Tables (2004) More from other references   
OpaqueHerve Nicolas Lazzarelli   

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Howlite and Thulite Optic Character

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

Similar to their colors, Howlite and Thulite 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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