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Hematite
Hematite

Foitite
Foitite



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Hematite
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Foitite

Hematite and Foitite Optical Properties

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1 Optical Properties
1.1 Luster
Not Available
Vitreous
1.2 Pleochroism
O = brownish red; E = yellowish red
Strong: pale lavender dark blueAnthony et al
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
TranslucentAnthony et al, Translucent
1.5 Refractive Index
2.690-3.220Not Available
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
1.8 Birefringence
0.280Not Available
Achroite
0 0.296
1.9 Clarity
OpaqueHerve Nicolas Lazzarelli
TranslucentAnthony et al

Hematite and Foitite Optic Character

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

Hematite and Foitite Transparency

Similar to their colors, Hematite and Foitite 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, Hematite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli while Hematite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli in appearance.