London blue topaz and Nepheline Optical Properties

London blue topaz

Nepheline

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1 Optical Properties

1.1 Luster

Not Available

Vitreous, Greasy

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Transparent, Translucent

1.5 Refractive Index

Not Available1.529-1.547

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Hexagonal

1.8 Birefringence

Not Available0.003-0.004

0 0.296

1.9 Clarity

Not Available

Transparent

London blue topaz and Nepheline Optic Character

London blue topaz and Nepheline optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the London blue topaz and Nepheline 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 London blue topaz and Nepheline 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.

Compare Blue Gemstones

London blue topaz Vs Indicolite

London blue topaz Vs Orbicular jasper

London blue topaz Vs Plasma

London blue topaz and Nepheline Transparency

Similar to their colors, London blue topaz and Nepheline 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, London blue topaz is Not Available while London blue topaz is Not Available in appearance.