Riebeckite and Phosgenite Optical Properties

Riebeckite

Phosgenite

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1 Optical Properties

1.1 Luster

Vitreous, Silky

Adamantine

1.2 Pleochroism

X = blue

Weakly pleochroic with O reddish and E greenish in thick sections.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.680-1.6982.117-2.145

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

tetragonal

1.8 Birefringence

0.005-0.0080.027

0 0.296

1.9 Clarity

Not Available

TransparentUlrich Henn and Claudio C. Milisenda

Riebeckite and Phosgenite Optic Character

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

Similar to their colors, Riebeckite and Phosgenite 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, Riebeckite is Not Available while Riebeckite is Not Available in appearance.