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Tortoiseshell
Tortoiseshell

Iolite
Iolite



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Tortoiseshell
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Iolite
2 Optical Properties
2.2 Luster
Not Available
Vitreous
2.3 Pleochroism
Not Available
Not Available
2.5 Dispersion
NANA
Fluorite Optical Properties
0.007 1
2.7 Transparency
Gemmological Tables (2004)
Transparent, Translucent, Transparent to translucent
2.8 Refractive Index
1.540-1.5601.52-1.56
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.9 Crystal System
Not Available
Orthorhombic
1.10 Birefringence
Not AvailableNot Available
Achroite
0 0.296
2.8 Clarity
OpaqueUlrich Henn and Claudio C. Milisenda
Transparent to translucent