Allanite and Erythrite Optical Properties

Allanite

Erythrite

Add ⊕

1 Optical Properties

1.1 Luster

Not Available

Subadamantine, Pearly

1.2 Pleochroism

Not Available

Visible: X = pale pinkish to pale rose; Y = pale violet to pale violet-rose; Z = deep red

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

1.5 Refractive Index

11.626-1.629

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

monoclinic

1.8 Birefringence

0.013-0.036Not Available

0 0.296

1.9 Clarity

Not Available

Allanite and Erythrite Optic Character

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

Allanite Vs Anthophyllite

Allanite Vs Augite

Allanite and Erythrite Transparency

Similar to their colors, Allanite and Erythrite 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.