Pearl and Erythrite Optical Properties

Pearl

Erythrite

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1 Optical Properties

1.1 Luster

Pearly

Subadamantine, Pearly

1.2 Pleochroism

AbsentWalter Schumann

Visible: X = pale pinkish to pale rose; Y = pale violet to pale violet-rose; Z = deep red

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Opaque

Not Available

1.5 Refractive Index

1.52-1.661.626-1.629

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.156Not Available

0 0.296

1.9 Clarity

Translucent

Not Available

Pearl and Erythrite Optic Character

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

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Pearl Vs Prase Opal

Pearl and Erythrite Transparency

Similar to their colors, Pearl and Erythrite 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.