Pycnochlorite

Where it forms, where it's found

31recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 18 15.999 287.982
51.81%
12MgMagnesium Magnesium 5 24.305 121.525
21.87%
14SiSilicon Silicon 3 28.085 84.255
15.16%
13AlAluminium Aluminium 2 26.982 53.964
9.71%
1HHydrogen Hydrogen 8 1.008 8.064
1.45%
Total 555.790 100.00%
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	18	15.999	287.982	51.81%
12MgMagnesium	Magnesium	5	24.305	121.525	21.87%
14SiSilicon	Silicon	3	28.085	84.255	15.16%
13AlAluminium	Aluminium	2	26.982	53.964	9.71%
1HHydrogen	Hydrogen	8	1.008	8.064	1.45%
	Total	555.790	100.00%

Synonyms

Pyknochlorite

Literature, links & citation

Citations

1901Fromme, J. (1901): Minerale aus dem Radautale, u. a. Pyknochlorit, eine neue Chloritart. Zeitschrift für Kristallographie, Mineralogie und Petrographie 22(1), 62-73.
1954Hey, Max H. (1954) A new review of the chlorites. Mineralogical Magazine and Journal of the Mineralogical Society, 30 (224) 277-292 doi:10.1180/minmag.1954.030.224.01 DOI: 10.1180/minmag.1954.030.224.01

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Pycnochlorite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/pycnochlorite-40405},
  note      = {Accessed 2026-05-11}
}