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Bertrandite
Bertrandite

Fayalite
Fayalite



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Bertrandite
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Fayalite

Bertrandite and Fayalite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Resinous
1.2 Pleochroism
none.
Faint
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
TransparentAnthony et al, Handbook of mineralogy (2001)
1.5 Refractive Index
1.583-1.6141.827-1.879
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Orthorhombic
1.8 Birefringence
Not Available0.042-0.051
Achroite
0 0.296
1.9 Clarity
TransparentAnthony et al
TransparentAnthony et al

Bertrandite and Fayalite Optic Character

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

Bertrandite and Fayalite Transparency

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