Polyhalite and Erythrite Optical Properties

Polyhalite

Erythrite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Subadamantine, Pearly

1.2 Pleochroism

Not Available

Visible: X = pale pinkish to pale rose; Y = pale violet to pale violet-rose; Z = deep red

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

1.5 Refractive Index

1.546-1.5481.626-1.629

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

monoclinic

1.8 Birefringence

0.021Not Available

0 0.296

1.9 Clarity

Not Available

Polyhalite and Erythrite Optic Character

Polyhalite and Erythrite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Polyhalite and Erythrite 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 Polyhalite and Erythrite 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 Red Gemstones

Polyhalite Vs Heliotrope

Polyhalite Vs Vanadinite

Polyhalite Vs Jacinth

Polyhalite and Erythrite Transparency

Similar to their colors, Polyhalite and Erythrite 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, Polyhalite is Not Available while Polyhalite is Not Available in appearance.