Cassiterite and Erythrite Optical Properties

Cassiterite

Erythrite

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1 Optical Properties

1.1 Luster

Adamantine, Greasy

Subadamantine, Pearly

1.2 Pleochroism

Pleochroic haloes have been observed. Dichroic in yellow

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

1.3 Dispersion

0.07NA

0.007 1

1.4 Transparency

Transparent, Translucent

Not Available

1.5 Refractive Index

1.990-2.1051.626-1.629

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

monoclinic

1.8 Birefringence

0.096-0.098Not Available

0 0.296

1.9 Clarity

Transparent

Not Available

Cassiterite and Erythrite Optic Character

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

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