Magnomagnetite

Where it forms, where it's found

4recorded occurrences

Source · OpenStreetMap

Physical

Transparency: Opaque
Colour: black
Streak: black or dark-grey
Tenacity: brittle
Cleavage: None Observed
Fracture: Irregular/Uneven

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
26FeIron Iron 3 55.845 167.535
65.49%
8OOxygen Oxygen 4 15.999 63.996
25.01%
12MgMagnesium Magnesium 1 24.305 24.305
9.50%
Total 255.836 100.00%
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
26FeIron	Iron	3	55.845	167.535	65.49%
8OOxygen	Oxygen	4	15.999	63.996	25.01%
12MgMagnesium	Magnesium	1	24.305	24.305	9.50%
	Total	255.836	100.00%

Literature, links & citation

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Magnomagnetite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/magnomagnetite-55642},
  note      = {Accessed 2026-05-11}
}