Papikeite

NaMg6Al(Si6Al2)O22(OH)2
IMA status
  • Approved
  • Pending publication
IMA symbol
Ppk
IMA approved
2023
Also known as
  • IMA2022-145
  • Papikeiet
  • Sodic-gedrite

Where it forms, where it's found

Type locality
Papikeite type locality
  1. Ærøya
  2. Arendal
  3. Agder
  4. Norway

58.4156°, 8.7675°

5recorded occurrences
Source · OpenStreetMap

Crystallography

Crystal system
Orthorhombic
Space group
Pnma
Cell parameters
a = 18.6322(6) Å · b = 17.8492(6) Å · c = 5.2811(2) Å
Ratio a:b:c
1 : 0.958 : 0.283
Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen2415.999383.976
47.74%
14SiSiliconSilicon628.085168.510
20.95%
12MgMagnesiumMagnesium624.305145.830
18.13%
13AlAluminiumAluminium326.98280.946
10.07%
11NaSodiumSodium122.99022.990
2.86%
1HHydrogenHydrogen21.0082.016
0.25%
Total804.268100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA2022-145
  • Papikeiet
  • Sodic-gedrite

In other languages

German
Papikeit
Italian
papikeite

Classification

Strunz
10th ed.

9.DD.05

  • 9SilicatesClass
  • 9.DInosilicatesDivision
  • 9.DDInosilicates with 2-periodic double chains, Si4O11; OrthoamphibolesGroup
  • 9.DD.05PapikeiteSpecies

Group, growth & confusion

In the same group
1 members

Literature, links & citation

Citations
  1. 2012Hawthorne, F. C., Oberti, R., Harlow, G. E., Maresch, W. V., Martin, R. F., Schumacher, J. C., Welch, M. D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist, 97 (11) 2031-2048 doi:10.2138/am.2012.4276 DOI: 10.2138/am.2012.4276
  2. 2022Kihle, Jan Braly Kihle, Hawthorne, Frank Christopher, Day, Maxwell Christopher (2022) The Mg-analogue of Ferro-Papikeite from UHT granulites at Ærøya (Bamble Sector), Norway: Description and crystal structure. Hot Spots and Mantle Geochemistry, Monday, 11 July 2022 Goldschmidt Hawai'i 2022.
  3. 2023Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2023) Newsletter 74. Mineralogical Magazine, 87 (5). 783-787 doi:10.1180/mgm.2023.54DOI: 10.1180/mgm.2023.54
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Papikeite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/papikeite-43390},
  note      = {Accessed 2026-05-11}
}