×

Petalite
Petalite

Powellite
Powellite



ADD
Compare
X
Petalite
X
Powellite

Petalite and Powellite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Pearly
Greasy, Subadamantine
1.2 Pleochroism
AbsentWalter Schumann
In deeply colored specimens: blue greenAnthony et al
1.3 Dispersion
0.01NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Transparent
1.5 Refractive Index
1.502-1.5231.974-1.984
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Not Available
1.8 Birefringence
0.012-0.016Not Available
Achroite
0 0.296
1.9 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent

Petalite and Powellite Optic Character

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

Petalite and Powellite Transparency

Similar to their colors, Petalite and Powellite 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, Petalite is Gemmological Tables (2004) More from other references while Petalite is Gemmological Tables (2004) More from other references in appearance.