Demantoid and Antigorite Optical Properties

Demantoid

Antigorite

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1 Optical Properties

1.1 Luster

Adamantine

Waxy, Silky, Resinous, Greasy

1.2 Pleochroism

None

pale greenish yellow.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Translucent

1.5 Refractive Index

1.880-1.8901.530-1.575

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

Monoclinic Domatic H-M Symbol (m) Space Group: Cm

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Translucent

Demantoid and Antigorite Optic Character

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

Similar to their colors, Demantoid and Antigorite 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.