Hureaulite and Andalusite Optical Properties

Hureaulite

Andalusite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

1.2 Pleochroism

Colorless yellow to pale rose reddish yellow to reddish brown.Anthony et al

strongly trichroic

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent

1.5 Refractive Index

1.647-1.6671.627-1.650

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c

Orthorhombic

1.8 Birefringence

0.0120.009-0.010

0 0.296

1.9 Clarity

Transparent

Hureaulite and Andalusite Optic Character

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

Similar to their colors, Hureaulite and Andalusite 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, Hureaulite is Transparent while Hureaulite is Transparent in appearance.