Spinel and Amblygonite Optical Properties

Spinel

Amblygonite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Pearly

1.2 Pleochroism

Absent

weak to none

1.3 Dispersion

0.020.01

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.731.578-1.646

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Isometric

Triclinic

1.8 Birefringence

Not Available0.020-0.030

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Spinel and Amblygonite Optic Character

Spinel and Amblygonite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Spinel and Amblygonite 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 Spinel and Amblygonite 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. Amblygonite has Biaxial/+ character.

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Spinel and Amblygonite Transparency

Similar to their colors, Spinel and Amblygonite 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, Spinel is Translucent, Transparent and Transparent to translucent while Spinel is Translucent, Transparent and Transparent to translucent in appearance.