Pumpellyite and Omphacite Optical Properties

Pumpellyite

Omphacite

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1 Optical Properties

1.1 Luster

Fibrous

Vitreous

1.2 Pleochroism

Not Available

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.674-1.7641.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.014-0.016Not Available

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

TranslucentAnthony et al

Pumpellyite and Omphacite Optic Character

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

Similar to their colors, Pumpellyite 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, Pumpellyite is Gemmological Tables (2004) while Pumpellyite is Gemmological Tables (2004) in appearance.