Crocoite and Purpurite Optical Properties

Crocoite

Purpurite

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1 Optical Properties

1.1 Luster

Adamantine

Not Available

1.2 Pleochroism

Distinctly trichroic

StrongArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

TranslucentWalter Schumann, Gemstones of the world (2001) More from other references

1.5 Refractive Index

2.31-2.661.85-1.92

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Orthorhombic

1.8 Birefringence

Not Available0.070

0 0.296

1.9 Clarity

Transparent

TranslucentWalter Schumann

Crocoite and Purpurite Optic Character

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

Similar to their colors, Crocoite and Purpurite 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, Crocoite is Transparent while Crocoite is Transparent in appearance.