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Prasiolite
Prasiolite

Bertrandite
Bertrandite



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Prasiolite
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Bertrandite

Prasiolite and Bertrandite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Very weak: light green pale greenWalter Schumann
none.
1.3 Dispersion
0.01NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
TransparentAnthony et al, Handbook of mineralogy (2001)
1.5 Refractive Index
1.544-1.5531.583-1.614
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
1.8 Birefringence
0.009Not Available
Achroite
0 0.296
1.9 Clarity
Transparent
TransparentAnthony et al

Prasiolite and Bertrandite Optic Character

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

Prasiolite and Bertrandite Transparency

Similar to their colors, Prasiolite 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, Prasiolite is Translucent and Transparent while Prasiolite is Translucent and Transparent in appearance.