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Polyhalite
Polyhalite

Grandidierite
Grandidierite



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Polyhalite
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Grandidierite

Polyhalite and Grandidierite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Resinous
Vitreous, Pearly
1.2 Pleochroism
Not Available
visible
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
Gemmological Tables (2004) More from other references
1.5 Refractive Index
1.546-1.5481.578-1.639
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Triclinic
Orthorhombic
1.8 Birefringence
0.0210.037-0.039
Achroite
0 0.296
1.9 Clarity
Not Available
Gemmological Tables (2004) More from other references

Polyhalite and Grandidierite Optic Character

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

Polyhalite and Grandidierite Transparency

Similar to their colors, Polyhalite and Grandidierite 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, Polyhalite is Not Available while Polyhalite is Not Available in appearance.