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Mellite
Mellite

Thulite
Thulite



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Mellite
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Thulite

Mellite and Thulite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Weak: yellowish brown yellowAnthony et al
Present
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Opaque, Translucent, Opaque . May be translucent in thin backlit sections.
1.5 Refractive Index
1.509-1.5411.695
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Orthorhombic
1.8 Birefringence
0.0300.006-0.018
Achroite
0 0.296
1.9 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
OpaqueHerve Nicolas Lazzarelli

Mellite and Thulite Optic Character

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

Mellite and Thulite Transparency

Similar to their colors, Mellite and Thulite 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, Mellite is Gemmological Tables (2004) More from other references while Mellite is Gemmological Tables (2004) More from other references in appearance.