Almandine and Bertrandite Optical Properties

Almandine

Bertrandite

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1 Optical Properties

1.1 Luster

Greasy, Vitreous

Vitreous

1.2 Pleochroism

None

none.

1.3 Dispersion

0.03NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.770-1.8201.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

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

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TransparentAnthony et al

Almandine and Bertrandite Optic Character

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

Similar to their colors, Almandine 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, Almandine is Gemmological Tables (2004) More from other references while Almandine is Gemmological Tables (2004) More from other references in appearance.