×

Forsterite
Forsterite

Sillimanite
Sillimanite



ADD
Compare
X
Forsterite
X
Sillimanite

Forsterite and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Subadamantine, Silky
1.2 Pleochroism
colorless.
Colourless to pale brown to yellow
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
Transparent, Translucent
1.5 Refractive Index
1.635-1.6711.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.033-0.0420.020-0.022
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Forsterite and Sillimanite Optic Character

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

Forsterite and Sillimanite Transparency

Similar to their colors, Forsterite 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, Forsterite is Transparent while Forsterite is Transparent in appearance.