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Sillimanite
Sillimanite

Brookite
Brookite



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Brookite

Sillimanite and Brookite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Adamantine
1.2 Pleochroism
Colourless to pale brown to yellow
Very weak
1.3 Dispersion
Albite Optical ..
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Fluorite Optical Properties
1.4 Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
1.5 Refractive Index
1.653-1.685
2.583-2.741
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.020-0.022
0.117
1.9 Clarity
Transparent
Gemmological Tables (2004) More from other references

Sillimanite and Brookite Optic Character

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

Similar to their colors, Sillimanite and Brookite 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.