Chrysoprase and Bastnasite Optical Properties

Chrysoprase

Bastnasite

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1 Optical Properties

1.1 Luster

Vitreous, Vitreous, Waxy

Vitreous, Greasy, Pearly

1.2 Pleochroism

AbsentWalter Schumann

Faint

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Translucent, Opaque, Translucent to nearly opaque

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.530-1.5431.717-1.722

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Hexagonal

1.8 Birefringence

0.0040.100

0 0.296

1.9 Clarity

Translucent

TransparentUlrich Henn and Claudio C. Milisenda

Chrysoprase and Bastnasite Optic Character

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

Similar to their colors, Chrysoprase and Bastnasite 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.