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Fayalite
Fayalite

Demantoid
Demantoid



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Fayalite
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Demantoid

Fayalite and Demantoid Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Resinous
Adamantine
1.2 Pleochroism
Faint
None
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
Gemmological Tables (2004)
1.5 Refractive Index
1.827-1.8791.880-1.890
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
cubic
1.8 Birefringence
0.042-0.051Not Available
Achroite
0 0.296
1.9 Clarity
TransparentAnthony et al
TransparentUlrich Henn and Claudio C. Milisenda

Fayalite and Demantoid Optic Character

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

Fayalite and Demantoid Transparency

Similar to their colors, Fayalite and Demantoid 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.