Demantoid and Proustite Optical Properties

Demantoid

Proustite

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1 Optical Properties

1.1 Luster

Adamantine

1.2 Pleochroism

None

Moderate; cochineal-red to blood-red

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

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

1.5 Refractive Index

1.880-1.8902.792-3.087

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

Trigonal

1.8 Birefringence

Not Available0.295-0.296

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

OpaqueUlrich Henn and Claudio C. Milisenda

Demantoid and Proustite Optic Character

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

Similar to their colors, Demantoid and Proustite 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.