Chrysoprase and Petalite Optical Properties

Chrysoprase

Petalite

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1 Optical Properties

1.1 Luster

Vitreous, Vitreous, Waxy

Vitreous, Pearly

1.2 Pleochroism

AbsentWalter Schumann

1.3 Dispersion

None0.01

0.007 1

1.4 Transparency

Translucent, Translucent, Opaque, Translucent to nearly opaque

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.530-1.5431.502-1.523

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

monoclinic

1.8 Birefringence

0.0040.012-0.016

0 0.296

1.9 Clarity

Translucent

TransparentUlrich Henn and Claudio C. Milisenda

Chrysoprase and Petalite Optic Character

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

Similar to their colors, Chrysoprase and Petalite 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, Chrysoprase is Opaque, Translucent, Translucent and Translucent to nearly opaque while Chrysoprase is Opaque, Translucent, Translucent and Translucent to nearly opaque in appearance.