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Phlogopite
Phlogopite

Euclase
Euclase



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Phlogopite
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Euclase

Phlogopite and Euclase Optical Properties

Optical Properties

Luster

Pearly
Vitreous

Pleochroism

-
Weak: colorless-(greenish) yellow

Dispersion

0.040.02
0.005 1
👆🏻

Transparency

-
-

Refractive Index

1.530-1.5731.650-1.677
1 3.25
👆🏻

Optic Character

-
-

Crystal System

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

Birefringence

0.0280-0.04500.019-0.025
0 0.296
👆🏻

Clarity

-
TransparentUlrich Henn and Claudio C. Milisenda

Phlogopite and Euclase Optic Character

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

Phlogopite and Euclase Transparency

Similar to their colors, Phlogopite 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, Phlogopite is while Phlogopite is in appearance.