Tourmaline and Goethite Optical Properties

Tourmaline

Goethite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

typically moderate to strong

VisibleArthur Thomas

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

Gemstones (2009)

1.5 Refractive Index

1.614-1.6662.26-2.398

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.014-0.0400.138

0 0.296

1.9 Clarity

Transparent

Gemstones (2009)

Tourmaline and Goethite Optic Character

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

Similar to their colors, Tourmaline and Goethite 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, Tourmaline is Translucent, Transparent and Transparent to opaque while Tourmaline is Translucent, Transparent and Transparent to opaque in appearance.