Norbergite and Cassiterite Optical Properties

Norbergite

Cassiterite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine, Greasy

1.2 Pleochroism

Pale yellow very pale yellow colorlessAnthony et al

Pleochroic haloes have been observed. Dichroic in yellow

1.3 Dispersion

NA0.07

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent

1.5 Refractive Index

1.563-1.5931.990-2.105

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

tetragonal

1.8 Birefringence

Not Available0.096-0.098

0 0.296

1.9 Clarity

Transparent

Norbergite and Cassiterite Optic Character

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

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