Friedelite and Hematite Optical Properties

Friedelite

Hematite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

NilArthur Thomas

O = brownish red; E = yellowish red

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references

1.5 Refractive Index

1.627-1.6632.690-3.220

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

Trigonal

1.8 Birefringence

0.032-0.0350.280

0 0.296

1.9 Clarity

Translucent

OpaqueHerve Nicolas Lazzarelli

Friedelite and Hematite Optic Character

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

Similar to their colors, Friedelite and Hematite 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.