Labradorite and Bertrandite Optical Properties

Labradorite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous

1.2 Pleochroism

From the Congo

none.

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.554-1.5731.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.008-0.010Not Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Labradorite and Bertrandite Optic Character

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

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