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Siderite and Sillimanite Optical Properties


Sillimanite and Siderite Optical Properties


Optical Properties

Luster
Pearly   
Vitreous, Subadamantine, Silky   

Pleochroism
Not Available   
Colourless to pale brown to yellow   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Translucent   
Transparent, Translucent   

Refractive Index
1.633-1.875   
1.653-1.685   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
0.242   
0.020-0.022   

Clarity
Transparent   
Transparent   

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Siderite and Sillimanite Optic Character

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

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

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