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Danburite
Danburite

Apatite
Apatite



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Danburite
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Apatite

Danburite and Apatite Optical Properties

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Optical Properties

Luster

Vitreous, Greasy
Vitreous

Pleochroism

Weak: pale yellow yellow
Blue stones – strong

Dispersion

0.020.01
0.005 1
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Transparency

-
-

Refractive Index

1.627-1.6391.628-1.651
1 3.25
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Optic Character

Biaxial/+
-

Crystal System

Orthorhombic
Hexagonal

Birefringence

0.0060.002-0.008
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
TransparentUlrich Henn and Claudio C. Milisenda

Danburite and Apatite Optic Character

Danburite and Apatite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Danburite and Apatite 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 Danburite and Apatite 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. Danburite has Biaxial/+ character.

Danburite and Apatite Transparency

Similar to their colors, Danburite and Apatite 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, Danburite is while Danburite is in appearance.