Fayalite and Lapis lazuli Optical Properties

Fayalite

Lapis lazuli

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous, Greasy

1.2 Pleochroism

Faint

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

Opaque

1.5 Refractive Index

1.827-1.8791.500-1.670

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal

1.8 Birefringence

0.042-0.051Not Available

0 0.296

1.9 Clarity

TransparentAnthony et al

Gemstones of the world (2001)

Fayalite and Lapis lazuli Optic Character

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

Compare Yellow Gemstones

Fayalite Vs Hackmanite

Fayalite Vs Garnet

Fayalite Vs Gadolinium Gallium Garnet

Fayalite and Lapis lazuli Transparency

Similar to their colors, Fayalite and Lapis lazuli 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, Fayalite is Handbook of mineralogy (2001) and TransparentAnthony et al while Fayalite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.