Franklinite and Hematite Optical Properties

Franklinite

Hematite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

Not Available

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

Not Available2.690-3.220

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

Trigonal

1.8 Birefringence

Not Available0.280

0 0.296

1.9 Clarity

Translucent

OpaqueHerve Nicolas Lazzarelli

Franklinite and Hematite Optic Character

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

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