Thulite and Dioptase Optical Properties

Thulite

Dioptase

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Present

Weak; dark emerald green

1.3 Dispersion

NA0.04

0.007 1

1.4 Transparency

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

TranslucentHerve Nicolas Lazzarelli

1.5 Refractive Index

1.6951.644-1.720

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal

1.8 Birefringence

0.006-0.0180.051-0.053

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

TranslucentHerve Nicolas Lazzarelli

Thulite and Dioptase Optic Character

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

Similar to their colors, Thulite and Dioptase 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.