Thulite and Mottramite Optical Properties

Thulite

Mottramite

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1 Optical Properties

1.1 Luster

Vitreous

Greasy

1.2 Pleochroism

Present

Visible X=Y= canary yellow to greenish yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Not Available

1.5 Refractive Index

1.6952.170

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.006-0.0180.150

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Not Available

Thulite and Mottramite Optic Character

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

Similar to their colors, Thulite and Mottramite 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.