Goethite and Augite Optical Properties

Goethite

Augite

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous, Resinous

1.2 Pleochroism

VisibleArthur Thomas

Pale green

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemstones (2009)

Transparent, Translucent

1.5 Refractive Index

2.26-2.3981.671-1.774

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c

1.8 Birefringence

0.138Not Available

0 0.296

1.9 Clarity

Gemstones (2009)

Transparent

Goethite and Augite Optic Character

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

Similar to their colors, Goethite and Augite 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.