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Astrophyllite
Astrophyllite

Tortoiseshell
Tortoiseshell



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Astrophyllite
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Tortoiseshell

Astrophyllite and Tortoiseshell Optical Properties

1 Optical Properties
1.1 Luster
Greasy, Pearly
Not Available
1.2 Pleochroism
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent
Gemmological Tables (2004)
1.5 Refractive Index
1.678-1.7581.540-1.560
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Triclinic
Not Available
1.8 Birefringence
0.050Not Available
Achroite
0 0.296
1.9 Clarity
Translucent
OpaqueUlrich Henn and Claudio C. Milisenda

Astrophyllite and Tortoiseshell Optic Character

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

Astrophyllite and Tortoiseshell Transparency

Similar to their colors, Astrophyllite and Tortoiseshell 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.