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Hibonite
Hibonite

Opal
Opal



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Hibonite
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Opal

Hibonite and Opal Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Pearly
1.2 Pleochroism
O = brownish gray; E = gray
None
1.3 Dispersion
NANone
Fluorite Optical Properties
0.007 1
1.4 Transparency
Handbook of mineralogy (2001)
Transparent, Translucent, Transparent to translucent
1.5 Refractive Index
1.79-1.8071.37-1.52
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Hexagonal
Trigonal
1.8 Birefringence
Not AvailableNot Available
Achroite
0 0.296
1.9 Clarity
Handbook of mineralogy (2001)
Transparent

Hibonite and Opal Optic Character

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

Similar to their colors, Hibonite and Opal 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.