Hurlbutite and Bertrandite Optical Properties

Hurlbutite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.595-1.6041.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

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

1.8 Birefringence

0.009Not Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Hurlbutite and Bertrandite Optic Character

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

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