Allanite and Dumortierite Optical Properties

Allanite

Dumortierite

Add ⊕

1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

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

Not Available

Translucent, Translucent to opaque

1.5 Refractive Index

11.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

0.013-0.0360.011-0.037

0 0.296

1.9 Clarity

Not Available

Translucent

Allanite and Dumortierite Optic Character

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

Allanite Vs Augite

Allanite Vs Astrophyllite

Allanite Vs Anthophyllite

Allanite and Dumortierite Transparency

Similar to their colors, Allanite 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, Allanite is Not Available while Allanite is Not Available in appearance.