Andesine and Mellite Optical Properties

Andesine

Mellite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

colorless.

Weak: yellowish brown yellowAnthony et al

1.3 Dispersion

0.70NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.543-1.5641.509-1.541

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Triclinic

Not Available

1.8 Birefringence

0.007-0.0110.030

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Andesine and Mellite Optic Character

Andesine and Mellite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Andesine and Mellite 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 Andesine and Mellite 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. Andesine has Biaxial/+ character.

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Andesine and Mellite Transparency

Similar to their colors, Andesine and Mellite 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, Andesine is Translucent, Transparent and Transparent to translucent while Andesine is Translucent, Transparent and Transparent to translucent in appearance.