Brazilianite and Omphacite Optical Properties

Brazilianite

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Very weakWalter Schumann

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

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.602-1.6251.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.019-0.021Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentAnthony et al

Brazilianite and Omphacite Optic Character

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

Similar to their colors, Brazilianite 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, Brazilianite is Gemmological Tables (2004) More from other references while Brazilianite is Gemmological Tables (2004) More from other references in appearance.