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Villiaumite
Villiaumite

Sard
Sard



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Villiaumite
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Sard

Villiaumite and Sard Optical Properties

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1 Optical Properties
1.1 Luster
Not Available
Waxy
1.2 Pleochroism
Yellow to pink/deep carmineMichael O’Donoghue
AbsentWalter Schumann
1.3 Dispersion
NANone
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Translucent
1.5 Refractive Index
1.328-1.3321.535-1.539
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Not Available
1.8 Birefringence
Not Available0.008-0.010
Achroite
0 0.296
1.9 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Translucent

Villiaumite and Sard Optic Character

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

Villiaumite and Sard Transparency

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