Andalusite and Rosasite Optical Properties

Andalusite

Rosasite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Silky, Vitreous

1.2 Pleochroism

strongly trichroic

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent

Not Available

1.5 Refractive Index

1.627-1.6501.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.009-0.0100.139-0.143

0 0.296

1.9 Clarity

Transparent

Not Available

Andalusite and Rosasite Optic Character

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

Similar to their colors, Andalusite and Rosasite 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.