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Bertrandite and Chlorite group Optical Properties


Chlorite group and Bertrandite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Pearly   

Pleochroism
none.   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)   
Not Available   

Refractive Index
1.583-1.614   
1.57-1.67   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21   
monoclinic   

Birefringence
Not Available   
Not Available   

Clarity
TransparentAnthony et al   
Not Available   

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Bertrandite and Chlorite group Optic Character

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

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Bertrandite and Chlorite group Transparency

Similar to their colors, Bertrandite and Chlorite group 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, Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al while Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.

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