Hurlbutite and Holmquistite Optical Properties

Hurlbutite

Holmquistite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

Strong in shades of violet when dark-colored.Anthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.595-1.6041.622-1.666

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 Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

1.8 Birefringence

0.009Not Available

0 0.296

1.9 Clarity

Transparent

Hurlbutite and Holmquistite Optic Character

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

Similar to their colors, Hurlbutite and Holmquistite 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.