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Hibonite
Hibonite

Astrophyllite
Astrophyllite



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Hibonite
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Astrophyllite

Hibonite and Astrophyllite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Greasy, Pearly
1.2 Pleochroism
O = brownish gray; E = gray
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Handbook of mineralogy (2001)
Translucent
1.5 Refractive Index
1.79-1.8071.678-1.758
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Hexagonal
Triclinic
1.8 Birefringence
Not Available0.050
Achroite
0 0.296
1.9 Clarity
Handbook of mineralogy (2001)
Translucent

Hibonite and Astrophyllite Optic Character

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

Hibonite and Astrophyllite Transparency

Similar to their colors, Hibonite and Astrophyllite 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, Hibonite is Handbook of mineralogy (2001) while Hibonite is Handbook of mineralogy (2001) in appearance.