Friedelite and Antigorite Optical Properties

Friedelite

Antigorite

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1 Optical Properties

1.1 Luster

Not Available

Waxy, Silky, Resinous, Greasy

1.2 Pleochroism

NilArthur Thomas

pale greenish yellow.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

1.5 Refractive Index

1.627-1.6631.530-1.575

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

1.8 Birefringence

0.032-0.035Not Available

0 0.296

1.9 Clarity

Translucent

Friedelite and Antigorite Optic Character

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

Similar to their colors, Friedelite 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, Friedelite is Translucent while Friedelite is Translucent in appearance.