Demantoid and Omphacite Optical Properties

Demantoid

Omphacite

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

None

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.880-1.8901.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentAnthony et al

Demantoid and Omphacite Optic Character

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

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