Vesuvianite and Grandidierite Optical Properties

Vesuvianite

Grandidierite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous, Pearly

1.2 Pleochroism

slight in colored varieties

visible

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.703-1.7521.578-1.639

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

Orthorhombic

1.8 Birefringence

0.004-0.0060.037-0.039

0 0.296

1.9 Clarity

Not Available

Gemmological Tables (2004) More from other references

Vesuvianite and Grandidierite Optic Character

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

Similar to their colors, Vesuvianite and Grandidierite 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, Vesuvianite is Not Available while Vesuvianite is Not Available in appearance.