. Author manuscript; available in PMC: 2018 Aug 20.

Published in final edited form as: Phys Chem Miner. 2017 May 19;45(1):1–26. doi: 10.1007/s00269-017-0897-y

Table 1.

Crystallographic and physical parameters for synthetic iron NPOs

Sample	Mineral	Formula	Crystal system	Space group	Grain shape	Width (nm)	Length (nm)
Fh	Ferrihydrite	5Fe₂O₃.9H₂O	Hexagonal	P6₃mc	Sphere	3 ± 1	-
Goet011515	Goethite	α-FeOOH	Orthorhombic	Pnma	Lathe	7 ± 2	96 ± 28
Goet012315	Goethite	α-FeOOH	Orthorhombic	Pnma	Lathe	3 ± 1	62 ± 18
Ak102315	Akaganéite	β-FeOOH	Monoclinic	I2/m	Lathe	41 ± 17	367 ± 143
Lep030415	Lepidocrocite	γ-FeOOH	Orthorhombic	Cmc2₁	Platelet	31 ± 12	237 ± 72
Hem100915	Hematite	α-Fe₂O₃	Trigonal	R3c	Sphere	6 ± 1	-
Magh061815	Maghemite	γ^-Fe₂O₃	Cubic	P4₁32	Irregular	6 ± 2	-
Mag060516	Magnetite	Fe₃O₄	Cubic	Fd3m	Sphere	12 ± 2	-