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Grandidierite
Grandidierite

Purpurite
Purpurite



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Grandidierite
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Purpurite

Grandidierite and Purpurite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Pearly
Not Available
1.2 Pleochroism
visible
StrongArthur Thomas
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
TranslucentWalter Schumann, Gemstones of the world (2001) More from other references
1.5 Refractive Index
1.578-1.6391.85-1.92
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.037-0.0390.070
Achroite
0 0.296
1.9 Clarity
Gemmological Tables (2004) More from other references
TranslucentWalter Schumann

Grandidierite and Purpurite Optic Character

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

Grandidierite and Purpurite Transparency

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