Thulite and Neptunite Optical Properties

Thulite

Neptunite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Present

x=yellow-orange

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Opaque, Translucent, Opaque . May be translucent in thin backlit sections.

Translucent

1.5 Refractive Index

1.6951.692-1.734

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.006-0.0180.0294-0.0452

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Translucent

Thulite and Neptunite Optic Character

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

Similar to their colors, Thulite and Neptunite 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, Thulite is Opaque, Opaque . May be translucent in thin backlit sections. and Translucent while Thulite is Opaque, Opaque . May be translucent in thin backlit sections. and Translucent in appearance.