Faustite and Bertrandite Optical Properties

Faustite

Bertrandite

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1 Optical Properties

1.1 Luster

Waxy

Vitreous

1.2 Pleochroism

Not Available

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.6121.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic Pinacoidal H-M Symbol ( 1) Space Group: P1

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

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Translucent

TransparentAnthony et al

Faustite and Bertrandite Optic Character

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

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