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Feldspar
Feldspar

Sunstone
Sunstone



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Feldspar
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Sunstone

Feldspar and Sunstone Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

None
Weak or absentWalter Schumann

Dispersion

0.010.01
0.005 1
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Transparency

Transparent, Translucent
Transparent, Translucent, Transparent to translucent

Refractive Index

1.518-1.5701.53-1.55
1 3.25
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Optic Character

-
-

Crystal System

Triclinic or monoclinic
Triclinic

Birefringence

0.008-0.0100.007-0.010
0 0.296
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Clarity

Transparent
Transparent to translucent

Feldspar and Sunstone Optic Character

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

Feldspar and Sunstone Transparency

Similar to their colors, Feldspar and Sunstone 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, Feldspar is Transparent and Translucent while Feldspar is Transparent and Translucent in appearance.