Andalusite and Erythrite Optical Properties

Andalusite

Erythrite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Subadamantine, Pearly

1.2 Pleochroism

strongly trichroic

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

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent

Not Available

1.5 Refractive Index

1.627-1.6501.626-1.629

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.009-0.010Not Available

0 0.296

1.9 Clarity

Transparent

Not Available

Andalusite and Erythrite Optic Character

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

Similar to their colors, Andalusite 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, Andalusite is Translucent and Transparent while Andalusite is Translucent and Transparent in appearance.