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Howlite
Howlite

Tantalite
Tantalite



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Howlite
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Tantalite

Howlite and Tantalite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Resinous
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
TransparentWalter Schumann, Gemstones of the world (2001) More from other references
1.5 Refractive Index
1.583-1.6082.190-2.457
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Orthorhombic
1.8 Birefringence
0.0190.083
Achroite
0 0.296
1.9 Clarity
Gemmological Tables (2004) More from other references
TransparentWalter Schumann

Howlite and Tantalite Optic Character

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

Similar to their colors, Howlite and Tantalite 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.