Phlogopite and Omphacite Optical Properties

Phlogopite

Omphacite

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1 Optical Properties

1.1 Luster

Pearly

Vitreous

1.2 Pleochroism

Not Available

Weak: colorless -- very pale green -- very pale green

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.530-1.5731.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.0280-0.0450Not Available

0 0.296

1.9 Clarity

Not Available

TranslucentAnthony et al

Phlogopite and Omphacite Optic Character

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

Similar to their colors, Phlogopite and Omphacite 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 Not Available while Phlogopite is Not Available in appearance.