Riebeckite and Bertrandite Optical Properties

Riebeckite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous, Silky

Vitreous

1.2 Pleochroism

X = blue

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.680-1.6981.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

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

1.8 Birefringence

0.005-0.008Not Available

0 0.296

1.9 Clarity

Not Available

TransparentAnthony et al

Riebeckite and Bertrandite Optic Character

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

Similar to their colors, Riebeckite 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, Riebeckite is Not Available while Riebeckite is Not Available in appearance.