Erythrite and Spinel Optical Properties

Erythrite

Spinel

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1 Optical Properties

1.1 Luster

Subadamantine, Pearly

Vitreous

1.2 Pleochroism

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

Absent

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Not Available

Transparent, Translucent, Transparent to translucent

1.5 Refractive Index

1.626-1.6291.73

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Isometric

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Not Available

TransparentUlrich Henn and Claudio C. Milisenda

Erythrite and Spinel Optic Character

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

Similar to their colors, Erythrite and Spinel 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, Erythrite is Not Available while Erythrite is Not Available in appearance.