Hexagonite and Bertrandite Optical Properties

Hexagonite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

bluish–red

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.599-1.6371.583-1.614

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

0.019-0.028Not Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Hexagonite and Bertrandite Optic Character

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

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