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Pyromorphite
Pyromorphite

Bastnasite
Bastnasite



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Pyromorphite
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Bastnasite

Pyromorphite and Bastnasite Optical Properties

Optical Properties

Luster

Resinous, Subadamantine
Vitreous, Greasy, Pearly

Pleochroism

Weak
Faint

Dispersion

0.030.02
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

2.042-2.0591.717-1.722
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Hexagonal
Hexagonal

Birefringence

0.0100.100
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Pyromorphite and Bastnasite Optic Character

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

Pyromorphite and Bastnasite Transparency

Similar to their colors, Pyromorphite 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, Pyromorphite is Transparent while Pyromorphite is Transparent in appearance.