×

Astrophyllite
Astrophyllite

Sillimanite
Sillimanite



ADD
Compare
X
Astrophyllite
X
Sillimanite

Astrophyllite and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Greasy, Pearly
Vitreous, Subadamantine, Silky
1.2 Pleochroism
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow
Colourless to pale brown to yellow
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent
Transparent, Translucent
1.5 Refractive Index
1.678-1.7581.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Triclinic
Orthorhombic
1.8 Birefringence
0.0500.020-0.022
Achroite
0 0.296
1.9 Clarity
Translucent
Transparent

Astrophyllite and Sillimanite Optic Character

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

Astrophyllite and Sillimanite Transparency

Similar to their colors, Astrophyllite 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.