Polyhalite and Rosasite Optical Properties

Polyhalite

Rosasite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Silky, Vitreous

1.2 Pleochroism

Not Available

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

1.5 Refractive Index

1.546-1.5481.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

monoclinic

1.8 Birefringence

0.0210.139-0.143

0 0.296

1.9 Clarity

Not Available

Polyhalite and Rosasite Optic Character

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

Polyhalite Vs Vanadinite

Polyhalite and Rosasite Transparency

Similar to their colors, Polyhalite and Rosasite 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.