Magnesiohongruiite-(Fe3+)

Where it forms, where it's found

Type locality: Bayan Obo deposit
Bayan Obo mining district
Baotou City
Inner Mongolia
China
41.7958°, 109.9694°

1recorded occurrences

Source · OpenStreetMap

Crystallography

Crystal system: Hexagonal
Space group: #114
Cell parameters: a = 5.9711(2) Å · c = 9.4375(3) Å

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 8 15.999 127.992
33.49%
26FeIron Iron 2 55.845 111.690
29.22%
41NbNiobium Niobium 1 92.906 92.906
24.31%
12MgMagnesium Magnesium 2 24.305 48.610
12.72%
1HHydrogen Hydrogen 1 1.008 1.008
0.26%
Total 382.206 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
8OOxygen	Oxygen	8	15.999	127.992	33.49%
26FeIron	Iron	2	55.845	111.690	29.22%
41NbNiobium	Niobium	1	92.906	92.906	24.31%
12MgMagnesium	Magnesium	2	24.305	48.610	12.72%
1HHydrogen	Hydrogen	1	1.008	1.008	0.26%
	Total	382.206	100.00%

Synonyms

IMA2025-049
Magnesiohongruiiet-(Fe3+)

Classification

Strunz

10th ed.

4.FL.70

4OxidesClass
4.FHydroxides (without V or U)Division
4.FLHydroxides with H₂O +- (OH); sheets of edge-sharing octahedraGroup
4.FL.70Magnesiohongruiite-(Fe3+)Species

Literature, links & citation

Citations

2025Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 88. Mineralogical Magazine, 89. 1-11 doi:10.1180/mgm.2025.10183DOI: 10.1180/mgm.2025.10183

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Magnesiohongruiite-(Fe3+) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/magnesiohongruiite-fe3-498743},
  note      = {Accessed 2026-05-11}
}