Omphacite and Demantoid Optical Properties

Omphacite

Demantoid

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

Weak: colorless -- very pale green -- very pale green

None

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TranslucentAnthony et al, Handbook of mineralogy (2001)

Gemmological Tables (2004)

1.5 Refractive Index

1.662-1.7231.880-1.890

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

cubic

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TranslucentAnthony et al

TransparentUlrich Henn and Claudio C. Milisenda

Omphacite and Demantoid Optic Character

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

Similar to their colors, Omphacite and Demantoid 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, Omphacite is Handbook of mineralogy (2001) and TranslucentAnthony et al while Omphacite is Handbook of mineralogy (2001) and TranslucentAnthony et al in appearance.