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Hibonite
Hibonite

Mottramite
Mottramite



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Hibonite
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Mottramite

Hibonite and Mottramite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Greasy
1.2 Pleochroism
O = brownish gray; E = gray
Visible X=Y= canary yellow to greenish yellow
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Handbook of mineralogy (2001)
Not Available
1.5 Refractive Index
1.79-1.8072.170
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Hexagonal
Orthorhombic
1.8 Birefringence
Not Available0.150
Achroite
0 0.296
1.9 Clarity
Handbook of mineralogy (2001)
Not Available

Hibonite and Mottramite Optic Character

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

Similar to their colors, Hibonite and Mottramite 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.