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Fluorapatite
Fluorapatite

Danburite
Danburite



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Fluorapatite
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Danburite

Fluorapatite and Danburite Optical Properties

Optical Properties

Luster

Vitreous, Resinous
Vitreous, Greasy

Pleochroism

Weak to strong if coloreD
Weak: pale yellow yellow

Dispersion

0.030.02
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

1.631-1.6501.627-1.639
1 3.25
👆🏻

Optic Character

-
Biaxial/+

Crystal System

Hexagonal
Orthorhombic

Birefringence

-99990.006
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Fluorapatite and Danburite Optic Character

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

Fluorapatite and Danburite Transparency

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