Goethite and Dumortierite Optical Properties

Goethite

Dumortierite

Add ⊕

1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

VisibleArthur Thomas

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

Gemstones (2009)

Translucent, Translucent to opaque

1.5 Refractive Index

2.26-2.3981.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.1380.011-0.037

0 0.296

1.9 Clarity

Gemstones (2009)

Translucent

Goethite and Dumortierite Optic Character

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

Compare Brown Gemstones

Goethite Vs Jacobsite

Goethite Vs Kyanite Cyprine

Goethite Vs Jadeite

Goethite and Dumortierite Transparency

Similar to their colors, Goethite and Dumortierite 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.