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Thulite and Astrophyllite Optical Properties


Astrophyllite and Thulite Optical Properties


Optical Properties

Luster
Vitreous   
Greasy, Pearly   

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

Dispersion
Not Available   
Not Available   

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

Refractive Index
1.695   
1.678-1.758   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Triclinic   

Birefringence
0.006-0.018   
0.050   

Clarity
OpaqueHerve Nicolas Lazzarelli   
Translucent   

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Thulite and Astrophyllite Optic Character

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

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

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