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Petalite and Feldspar Optical Properties


Feldspar and Petalite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous   

Pleochroism
AbsentWalter Schumann   
None   

Dispersion
0.01   
25
Not Available   

Transparency
Gemmological Tables (2004) More from other references   
Transparent, Translucent   

Refractive Index
1.502-1.523   
1.518-1.570   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Triclinic or monoclinic   

Birefringence
0.012-0.016   
0.008-0.010   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Transparent   

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Petalite and Feldspar Optic Character

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

Similar to their colors, Petalite and Feldspar 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, Petalite is Gemmological Tables (2004) More from other references while Petalite is Gemmological Tables (2004) More from other references in appearance.

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