Bastnasite and Euclase Optical Properties

Bastnasite

Euclase

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1 Optical Properties

1.1 Luster

Vitreous, Greasy, Pearly

Vitreous

1.2 Pleochroism

Faint

Weak: colorless-(greenish) yellow

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.717-1.7221.650-1.677

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

1.8 Birefringence

0.1000.019-0.025

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Bastnasite and Euclase Optic Character

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

Similar to their colors, Bastnasite and Euclase 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, Bastnasite is Gemmological Tables (2004) More from other references while Bastnasite is Gemmological Tables (2004) More from other references in appearance.