Danburite and Omphacite Optical Properties

Danburite

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Vitreous

1.2 Pleochroism

Weak: pale yellow yellow

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

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.627-1.6391.662-1.723

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.006Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentAnthony et al

Danburite and Omphacite Optic Character

Danburite and Omphacite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Danburite 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 Danburite 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. Danburite has Biaxial/+ character.

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Danburite and Omphacite Transparency

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