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Purpurite
Purpurite

Nepheline
Nepheline



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Purpurite
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Nepheline

Purpurite and Nepheline Optical Properties

1 Optical Properties
1.1 Luster
Not Available
Vitreous, Greasy
1.2 Pleochroism
StrongArthur Thomas
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
TranslucentWalter Schumann, Gemstones of the world (2001) More from other references
Transparent, Translucent
1.5 Refractive Index
1.85-1.921.529-1.547
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Hexagonal
1.8 Birefringence
0.0700.003-0.004
Achroite
0 0.296
1.9 Clarity
TranslucentWalter Schumann
Transparent

Purpurite and Nepheline Optic Character

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

Purpurite and Nepheline Transparency

Similar to their colors, Purpurite and Nepheline 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.