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Sillimanite
Sillimanite

Atacamite
Atacamite



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Sillimanite
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Atacamite

Sillimanite and Atacamite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Adamantine, Vitreous
1.2 Pleochroism
Colourless to pale brown to yellow
X = pale green; Y = yellow-green; Z = grass-green
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Not Available
1.5 Refractive Index
1.653-1.6851.831
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.020-0.0220.049
Achroite
0 0.296
1.9 Clarity
Transparent
Not Available

Sillimanite and Atacamite Optic Character

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

Sillimanite and Atacamite Transparency

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