Fayalite and Proustite Optical Properties

Fayalite

Proustite

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous, Resinous

Adamantine

1.2 Pleochroism

Faint

Moderate; cochineal-red to blood-red

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references

1.5 Refractive Index

1.827-1.8792.792-3.087

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal

1.8 Birefringence

0.042-0.0510.295-0.296

0 0.296

1.9 Clarity

TransparentAnthony et al

OpaqueUlrich Henn and Claudio C. Milisenda

Fayalite and Proustite Optic Character

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

Fayalite Vs Hackmanite

Fayalite Vs Gadolinium Gallium Garnet

Fayalite and Proustite Transparency

Similar to their colors, Fayalite and Proustite 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.