Hurlbutite and Proustite Optical Properties

Hurlbutite

Proustite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

Not Available

Moderate; cochineal-red to blood-red

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

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

1.5 Refractive Index

1.595-1.6042.792-3.087

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

Trigonal

1.8 Birefringence

0.0090.295-0.296

0 0.296

1.9 Clarity

Transparent

OpaqueUlrich Henn and Claudio C. Milisenda

Hurlbutite and Proustite Optic Character

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

Similar to their colors, Hurlbutite 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, Hurlbutite is Transparent while Hurlbutite is Transparent in appearance.