Astrophyllite and Hureaulite Optical Properties

Astrophyllite

Hureaulite

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1 Optical Properties

1.1 Luster

Greasy, Pearly

Vitreous, Greasy

1.2 Pleochroism

Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

Transparent

1.5 Refractive Index

1.678-1.7581.647-1.667

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.0500.012

0 0.296

1.9 Clarity

Translucent

Transparent

Astrophyllite and Hureaulite Optic Character

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

Similar to their colors, Astrophyllite and Hureaulite 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.