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Goethite and Howlite Optical Properties


Howlite and Goethite Optical Properties


Optical Properties

Luster
Adamantine   
Vitreous   

Pleochroism
VisibleArthur Thomas   
NilArthur Thomas   

Dispersion
Not Available   
Not Available   

Transparency
Gemstones (2009)   
Gemmological Tables (2004) More from other references   

Refractive Index
2.26-2.398   
1.583-1.608   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
monoclinic   

Birefringence
0.138   
0.019   

Clarity
Gemstones (2009)   
Gemmological Tables (2004) More from other references   

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Goethite and Howlite Optic Character

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

Similar to their colors, Goethite and Howlite 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, Goethite is Gemstones (2009) while Goethite is Gemstones (2009) in appearance.

Brown Gemstones

Brown Gemstones


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