Zoisite and Astrophyllite Optical Properties

Zoisite

Astrophyllite

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1 Optical Properties

1.1 Luster

Vitreous

Greasy, Pearly

1.2 Pleochroism

X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

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

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

Translucent

1.5 Refractive Index

1.685-1.7071.678-1.758

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Triclinic

1.8 Birefringence

0.006-0.0180.050

0 0.296

1.9 Clarity

Transparent

Translucent

Zoisite and Astrophyllite Optic Character

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

Similar to their colors, Zoisite and Astrophyllite 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, Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent while Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent in appearance.