Picotite

Where it forms, where it's found

112recorded occurrences

Source · OpenStreetMap

Varieties

ChrompicotiteFe²⁺Al₂O₄
Variety
—

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
24CrChromium Chromium 2 51.996 103.992
34.42%
8OOxygen Oxygen 4 15.999 63.996
21.18%
26FeIron Iron 1 55.845 55.845
18.49%
13AlAluminium Aluminium 2 26.982 53.964
17.86%
12MgMagnesium Magnesium 1 24.305 24.305
8.05%
Total 302.102 100.00%
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
24CrChromium	Chromium	2	51.996	103.992	34.42%
8OOxygen	Oxygen	4	15.999	63.996	21.18%
26FeIron	Iron	1	55.845	55.845	18.49%
13AlAluminium	Aluminium	2	26.982	53.964	17.86%
12MgMagnesium	Magnesium	1	24.305	24.305	8.05%
	Total	302.102	100.00%

Synonyms

Chrome Ceylonite
Picotit
Picotita

Literature, links & citation

Citations

1882Wadsworth, M.E. (1882), On picotite from Mt. Shasta, California. Boston Society of Natural History Proceedings: 21: 314-315
1960Köster, Heinrich Martin (1960) Nontronit und Picotit aus dem Basalt des Ölberges bei Hundsangen, Westerwald. Beiträge zur Mineralogie und Petrographie, 7 (2). 71-75 doi:10.1007/bf01154324DOI: 10.1007/bf01154324
1972DREVER, H. I., JOHNSTON, R., GIBB, F. G. F. (1972) Chromian Pleonaste and Aluminous Picotite in Two Apollo 14 Microbreccias 14306 and 14055. Nature Physical Science, 235. 30-31 doi:10.1038/physci235030a0DOI: 10.1038/physci235030a0

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Picotite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/picotite-9769},
  note      = {Accessed 2026-05-11}
}