Iron-bearing Phlogopite

Where it forms, where it's found

7recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 12 15.999 191.988
30.83%
26FeIron Iron 3 55.845 167.535
26.90%
14SiSilicon Silicon 3 28.085 84.255
13.53%
12MgMagnesium Magnesium 3 24.305 72.915
11.71%
19KPotassium Potassium 1 39.098 39.098
6.28%
9FFluorine Fluorine 2 18.998 37.996
6.10%
13AlAluminium Aluminium 1 26.982 26.982
4.33%
1HHydrogen Hydrogen 2 1.008 2.016
0.32%
Total 622.785 100.00%
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	12	15.999	191.988	30.83%
26FeIron	Iron	3	55.845	167.535	26.90%
14SiSilicon	Silicon	3	28.085	84.255	13.53%
12MgMagnesium	Magnesium	3	24.305	72.915	11.71%
19KPotassium	Potassium	1	39.098	39.098	6.28%
9FFluorine	Fluorine	2	18.998	37.996	6.10%
13AlAluminium	Aluminium	1	26.982	26.982	4.33%
1HHydrogen	Hydrogen	2	1.008	2.016	0.32%
	Total	622.785	100.00%

Synonyms

Ferroan Phlogopite
Mg-Al Biotit
Mg-Al Biotite

Literature, links & citation

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Iron-bearing Phlogopite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/iron-bearing-phlogopite-11561},
  note      = {Accessed 2026-05-11}
}