Mg-rich Siderite

Where it forms, where it's found

37recorded occurrences

Source · OpenStreetMap

Varieties

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
26FeIron Iron 1 55.845 55.845
39.84%
8OOxygen Oxygen 3 15.999 47.997
34.25%
12MgMagnesium Magnesium 1 24.305 24.305
17.34%
6CCarbon Carbon 1 12.011 12.011
8.57%
Total 140.158 100.00%
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	1	55.845	55.845	39.84%
8OOxygen	Oxygen	3	15.999	47.997	34.25%
12MgMagnesium	Magnesium	1	24.305	24.305	17.34%
6CCarbon	Carbon	1	12.011	12.011	8.57%
	Total	140.158	100.00%

Synonyms

Magnesian Siderite
Magniosiderit
Magniosiderita
Magniosiderite

Literature, links & citation

Citations

1962Goldsmith, Julian R., Graf, Donald L., Witters, Juanita, Northrop, David A. (1962) Studies in the System CaCO3-MgCO3-FeCO3: 1. Phase Relations; 2. A Method for Major-Element Spectrochemical Analysis; 3. Compositions of Some Ferroan Dolomites. The Journal of Geology, 70 (6) 659-688 doi:10.1086/626865DOI: 10.1086/626865

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Mg-rich Siderite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/mg-rich-siderite-25667},
  note      = {Accessed 2026-05-11}
}