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Diaspore and Petalite Optical Properties


Petalite and Diaspore Optical Properties


Optical Properties

Luster
Pearly   
Vitreous, Pearly   

Pleochroism
Strong   
AbsentWalter Schumann   

Dispersion
Not Available   
0.01   
25

Transparency
Transparent   
Gemmological Tables (2004) More from other references   

Refractive Index
1.702-1.750   
1.502-1.523   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
monoclinic   

Birefringence
0.048   
0.012-0.016   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Diaspore and Petalite Optic Character

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

Similar to their colors, Diaspore and Petalite 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, Diaspore is Transparent while Diaspore is Transparent in appearance.

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