Hurlbutite and Dravite Optical Properties

Hurlbutite

Dravite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

Very strong: pale yellow colorless

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.595-1.6041.614-1.666

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

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

1.8 Birefringence

0.0090.014-0.032

0 0.296

1.9 Clarity

Transparent

Hurlbutite and Dravite Optic Character

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

Similar to their colors, Hurlbutite and Dravite 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.