Forsterite and Bertrandite Optical Properties

Forsterite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

colorless.

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.635-1.6711.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

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

1.8 Birefringence

0.033-0.042Not Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Forsterite and Bertrandite Optic Character

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

Similar to their colors, Forsterite 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, Forsterite is Transparent while Forsterite is Transparent in appearance.