Phenakite and Boulder Opal Optical Properties

Phenakite

Boulder Opal

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli

AbsentWalter Schumann

1.3 Dispersion

0.02None

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Transparent, Translucent

1.5 Refractive Index

1.650-1.6951.370-1.470

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

0.016Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Phenakite and Boulder Opal Optic Character

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

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