Pistomesite

Where it forms, where it's found

25recorded occurrences

Source · OpenStreetMap

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

Pistomesit

Literature, links & citation

Citations

1847Breithaupt (1847) Annalen der Physik, Halle, Leipzig: 70: 146.
1951Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Pistomesite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/pistomesite-25664},
  note      = {Accessed 2026-05-11}
}