Garnet and Bertrandite Optical Properties

Garnet

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Vitreous, Adamantine

Vitreous

1.2 Pleochroism

None

none.

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Transparent to translucent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.730-1.8951.583-1.614

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

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Garnet and Bertrandite Optic Character

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

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