Carnelian and Bertrandite Optical Properties

Carnelian

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

none.

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Transparent to nearly opaque

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.535-1.5391.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

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

1.8 Birefringence

0.003-0.009Not Available

0 0.296

1.9 Clarity

Translucent

TransparentAnthony et al

Carnelian and Bertrandite Optic Character

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

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Carnelian and Bertrandite Transparency

Similar to their colors, Carnelian 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, Carnelian is Translucent and Transparent to nearly opaque while Carnelian is Translucent and Transparent to nearly opaque in appearance.