Pearl and Mellite Optical Properties

Pearl

Mellite

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1 Optical Properties

1.1 Luster

Pearly

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Weak: yellowish brown yellowAnthony et al

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Opaque

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.52-1.661.509-1.541

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.1560.030

0 0.296

1.9 Clarity

Translucent

TransparentUlrich Henn and Claudio C. Milisenda

Pearl and Mellite Optic Character

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

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Pearl Vs Prase Opal

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Pearl and Mellite Transparency

Similar to their colors, Pearl 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, Pearl is Opaque and Translucent while Pearl is Opaque and Translucent in appearance.