Friedelite and Fayalite Optical Properties

Friedelite

Fayalite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous, Resinous

1.2 Pleochroism

NilArthur Thomas

Faint

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.627-1.6631.827-1.879

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m

Orthorhombic

1.8 Birefringence

0.032-0.0350.042-0.051

0 0.296

1.9 Clarity

Translucent

TransparentAnthony et al

Friedelite and Fayalite Optic Character

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

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Friedelite and Fayalite Transparency

Similar to their colors, Friedelite 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, Friedelite is Translucent while Friedelite is Translucent in appearance.