Oligoclase and Williamsite Optical Properties

Oligoclase

Williamsite

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1 Optical Properties

1.1 Luster

Vitreous

Waxy, Silky, Resinous, Greasy

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

TranslucentHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)

1.5 Refractive Index

1.538-1.5501.530-1.575

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

1.8 Birefringence

0.010Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentHerve Nicolas Lazzarelli

Oligoclase and Williamsite Optic Character

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

Similar to their colors, Oligoclase and Williamsite 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, Oligoclase is Gemmological Tables (2004) while Oligoclase is Gemmological Tables (2004) in appearance.