Proustite and Neptunite Optical Properties

Proustite

Neptunite

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

Moderate; cochineal-red to blood-red

x=yellow-orange

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references

Translucent

1.5 Refractive Index

2.792-3.0871.692-1.734

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

monoclinic

1.8 Birefringence

0.295-0.2960.0294-0.0452

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

Translucent

Proustite and Neptunite Optic Character

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

Similar to their colors, Proustite and Neptunite 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, Proustite is OpaqueUlrich Henn and Claudio C. Milisenda and Gemmological Tables (2004) Rarely transparentMore from other references while Proustite is OpaqueUlrich Henn and Claudio C. Milisenda and Gemmological Tables (2004) Rarely transparentMore from other references in appearance.