Fayalite and Cassiterite Optical Properties

Fayalite

Cassiterite

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous, Resinous

Adamantine, Greasy

1.2 Pleochroism

Faint

Pleochroic haloes have been observed. Dichroic in yellow

1.3 Dispersion

NA0.07

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

Transparent, Translucent

1.5 Refractive Index

1.827-1.8791.990-2.105

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

tetragonal

1.8 Birefringence

0.042-0.0510.096-0.098

0 0.296

1.9 Clarity

TransparentAnthony et al

Transparent

Fayalite and Cassiterite Optic Character

Fayalite and Cassiterite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Fayalite and Cassiterite 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 Cassiterite 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 Gadolinium Gallium Garnet

Fayalite Vs Hackmanite

Fayalite Vs Garnet

Fayalite and Cassiterite Transparency

Similar to their colors, Fayalite and Cassiterite 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.