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Dravite
Dravite

Fayalite
Fayalite



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Fayalite

Dravite and Fayalite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Resinous
1.2 Pleochroism
Very strong: pale yellow colorless
Faint
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
TransparentAnthony et al, Handbook of mineralogy (2001)
1.5 Refractive Index
1.614-1.6661.827-1.879
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Orthorhombic
1.8 Birefringence
0.014-0.0320.042-0.051
Achroite
0 0.296
1.9 Clarity
Transparent
TransparentAnthony et al

Dravite and Fayalite Optic Character

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

Dravite and Fayalite Transparency

Similar to their colors, Dravite and Fayalite 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, Dravite is Transparent while Dravite is Transparent in appearance.