Mellite and Dallasite Optical Properties

Mellite

Dallasite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Weak: yellowish brown yellowAnthony et al

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Not Available

1.5 Refractive Index

1.509-1.5411.540

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

0.0300.008-0.010

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Not Available

Mellite and Dallasite Optic Character

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

Similar to their colors, Mellite and Dallasite 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.