Apatite and Rosasite Optical Properties

Apatite

Rosasite

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1 Optical Properties

1.1 Luster

Vitreous

Silky, Vitreous

1.2 Pleochroism

Blue stones – strong

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

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Not Available

1.5 Refractive Index

1.628-1.6511.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

monoclinic

1.8 Birefringence

0.002-0.0080.139-0.143

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Not Available

Apatite and Rosasite Optic Character

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

Similar to their colors, Apatite 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, Apatite is Gemmological Tables (2004) More from other references while Apatite is Gemmological Tables (2004) More from other references in appearance.