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Howlite
Howlite

Nuummite
Nuummite



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Howlite
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Nuummite

Howlite and Nuummite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Not Available
1.2 Pleochroism
NilArthur Thomas
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Gemmological Tables (2004) More from other references
1.5 Refractive Index
1.583-1.6081.635-1.663
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Not Available
1.8 Birefringence
0.0190.0170-0.230
Achroite
0 0.296
1.9 Clarity
Gemmological Tables (2004) More from other references
Gemmological Tables (2004) More from other references

Howlite and Nuummite Optic Character

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

Howlite and Nuummite Transparency

Similar to their colors, Howlite and Nuummite 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.