Lapis lazuli and Rosasite Optical Properties

Lapis lazuli

Rosasite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Silky, Vitreous

1.2 Pleochroism

AbsentWalter Schumann

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

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Opaque

Not Available

1.5 Refractive Index

1.500-1.6701.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

monoclinic

1.8 Birefringence

Not Available0.139-0.143

0 0.296

1.9 Clarity

Gemstones of the world (2001)

Not Available

Lapis lazuli and Rosasite Optic Character

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

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Lapis lazuli and Rosasite Transparency

Similar to their colors, Lapis lazuli 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, Lapis lazuli is Opaque while Lapis lazuli is Opaque in appearance.