Tourmaline and Almandine Optical Properties

Tourmaline

Almandine

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous

Greasy, Vitreous

1.2 Pleochroism

typically moderate to strong

None

1.3 Dispersion

0.020.03

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.614-1.6661.770-1.820

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

cubic

1.8 Birefringence

0.014-0.040Not Available

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Tourmaline and Almandine Optic Character

Tourmaline and Almandine optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Tourmaline and Almandine 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 Tourmaline and Almandine 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 Semi Precious Gemstones

Tourmaline Vs Beryl

Tourmaline Vs Citrine

Tourmaline Vs Amethyst

Tourmaline and Almandine Transparency

Similar to their colors, Tourmaline and Almandine 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, Tourmaline is Translucent, Transparent and Transparent to opaque while Tourmaline is Translucent, Transparent and Transparent to opaque in appearance.