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Purpurite
Purpurite

Danburite
Danburite



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Purpurite
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Danburite

Purpurite and Danburite Optical Properties

1 Optical Properties
1.1 Luster
Not Available
Vitreous, Greasy
1.2 Pleochroism
StrongArthur Thomas
Weak: pale yellow yellow
1.3 Dispersion
NA0.02
Fluorite Optical Properties
0.007 1
1.4 Transparency
TranslucentWalter Schumann, Gemstones of the world (2001) More from other references
Gemmological Tables (2004) More from other references
1.5 Refractive Index
1.85-1.921.627-1.639
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Biaxial/+
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.0700.006
Achroite
0 0.296
1.9 Clarity
TranslucentWalter Schumann
TransparentUlrich Henn and Claudio C. Milisenda

Purpurite and Danburite Optic Character

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

Purpurite and Danburite Transparency

Similar to their colors, Purpurite 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, Purpurite is Gemstones of the world (2001) More from other references and TranslucentWalter Schumann while Purpurite is Gemstones of the world (2001) More from other references and TranslucentWalter Schumann in appearance.