Sard and Bertrandite Optical Properties

Sard

Bertrandite

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1 Optical Properties

1.1 Luster

Waxy

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

none.

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent

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

Not Available

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

1.8 Birefringence

0.008-0.010Not Available

0 0.296

1.9 Clarity

Translucent

TransparentAnthony et al

Sard and Bertrandite Optic Character

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

Similar to their colors, Sard 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, Sard is Translucent while Sard is Translucent in appearance.