Bastnasite and Apache Tear Optical Properties

Bastnasite

Apache Tear

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1 Optical Properties

1.1 Luster

Vitreous, Greasy, Pearly

Not Available

1.2 Pleochroism

Faint

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Not Available

1.5 Refractive Index

1.717-1.722Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Amorphous

1.8 Birefringence

0.100Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Not Available

Bastnasite and Apache Tear Optic Character

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

Similar to their colors, Bastnasite and Apache Tear 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.