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Emerald
Emerald

Bertrandite
Bertrandite



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Bertrandite

Emerald and Bertrandite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Strong dichroism: yellow green Lazzarelli
none.
1.3 Dispersion
Albite Optical ..
0.01
Rank: 26 (Overall)
Not Available
Rank: N/A (Overall)
Fluorite Optical Properties
1.4 Transparency
Transparent, Translucent, Transparent to translucent
TransparentAnthony et al, Handbook of mineralogy (2001)
1.5 Refractive Index
1.565-1.602
1.583-1.614
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Hexagonal
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
1.8 Birefringence
0.0040-0.0070
Not Available
1.9 Clarity
Color grading system
TransparentAnthony et al

Emerald and Bertrandite Optic Character

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

Emerald and Bertrandite Transparency

Similar to their colors, Emerald and Bertrandite 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, Emerald is Translucent, Transparent and Transparent to translucent while Emerald is Translucent, Transparent and Transparent to translucent in appearance.