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Gypsum
Gypsum

Antigorite
Antigorite



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Gypsum
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Antigorite

Gypsum and Antigorite Optical Properties

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Optical Properties

Luster

Vitreous, Silky, Pearly, Waxy
Waxy, Silky, Resinous, Greasy

Pleochroism

None
pale greenish yellow

Dispersion

0.010.02
0.005 1
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Transparency

Transparent, Translucent
Translucent

Refractive Index

1.521-1.5311.530-1.575
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

0.010-9999
0 0.296
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Clarity

Transparent
Translucent

Gypsum and Antigorite Optic Character

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

Gypsum and Antigorite Transparency

Similar to their colors, Gypsum 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, Gypsum is Transparent and Translucent while Gypsum is Transparent and Translucent in appearance.