Zinc Ferrite Spinell
ZnFe2O4
Chemical name
Zinc Ferrite Spinell |
Mineral name
Franklinite |
Chemical formula
ZnFe2O4 |
Melting point [°C]
Varies by solvent |
Crystal system
cubic |
Crystal Class
cubic-hexoctahedral (4/m -3 2/m) |
Space Group
Fd-3m |
Unit cell
a [Å]:8.42 b [Å]:8.42 c [Å]:8.42 |
Molecular weight [g/mol]
241.08 |
Formula units
Z=8 |
Frequent crystal surfaces
{111}, {100}, {110} |
Twinning
on (111) |
Mohs hardness
6 - 6.5 |
Density [g/cm3]
5.07 - 5.22 |
Cleavage
on {111} |
Fracture / Tenacity
conchoidal, uneven/irregular |
Color
black |
Streak
reddish brown to black |
Transparency
opaque |
Luster
metallic to dull |
Optical character
isotropic |
Refractive Index
n=2.35 |
Pleochroism δ
none |