Tantalite and Omphacite Optical Properties

Tantalite

Omphacite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Not Available

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentWalter Schumann, Gemstones of the world (2001) More from other references

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

2.190-2.4571.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.083Not Available

0 0.296

1.9 Clarity

TransparentWalter Schumann

TranslucentAnthony et al

Tantalite and Omphacite Optic Character

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

Similar to their colors, Tantalite 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, Tantalite is Gemstones of the world (2001) More from other references and TransparentWalter Schumann while Tantalite is Gemstones of the world (2001) More from other references and TransparentWalter Schumann in appearance.