Goethite and Manganotantalite Optical Properties

Goethite

Manganotantalite

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1 Optical Properties

1.1 Luster

Adamantine

Not Available

1.2 Pleochroism

VisibleArthur Thomas

Sometimes strongArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemstones (2009)

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

1.5 Refractive Index

2.26-2.3982.19-2.34

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.1380.015

0 0.296

1.9 Clarity

Gemstones (2009)

TransparentWalter Schumann

Goethite and Manganotantalite Optic Character

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

Similar to their colors, Goethite and Manganotantalite 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, Goethite is Gemstones (2009) while Goethite is Gemstones (2009) in appearance.