Omphacite and Lapis lazuli Optical Properties

Omphacite

Lapis lazuli

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Greasy

1.2 Pleochroism

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

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

TranslucentAnthony et al, Handbook of mineralogy (2001)

Opaque

1.5 Refractive Index

1.662-1.7231.500-1.670

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Trigonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TranslucentAnthony et al

Gemstones of the world (2001)

Omphacite and Lapis lazuli Optic Character

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

Similar to their colors, Omphacite and Lapis lazuli 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, Omphacite is Handbook of mineralogy (2001) and TranslucentAnthony et al while Omphacite is Handbook of mineralogy (2001) and TranslucentAnthony et al in appearance.