Llantenesite

Cu6Al[SeO4](OH)12Cl · 3H2O
IMA status
  • Approved
  • Pending publication
IMA symbol
Lla
IMA approved
2019
Also known as
  • IMA2018-111
  • Llantenesiet

Where it forms, where it's found

Type locality
San Pedro mine
  1. Jagüé
  2. Vinchina Department
  3. La Rioja Province
  4. Argentina

-28.4863°, -68.6523°

1recorded occurrences
Source · OpenStreetMap

Safety & handling

Crystallography

Crystal system
Trigonal
Space group
#81
Cell parameters
a = 8.2603(3) Å · c = 14.5953(4) Å

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
29CuCopperCopper663.546381.276
45.13%
8OOxygenOxygen1915.999303.981
35.98%
34SeSeleniumSelenium178.97178.971
9.35%
17ClChlorineChlorine135.45035.450
4.20%
13AlAluminiumAluminium126.98226.982
3.19%
1HHydrogenHydrogen181.00818.144
2.15%
Total844.804100.00%

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

From IMA formula

Synonyms

  • IMA2018-111
  • Llantenesiet

In other languages

German
Llantenesit

Classification

Strunz
10th ed.

7.DD.07

  • 7SulfatesClass
  • 7.DSulfates (selenates, etc.) with additional anions, with H2ODivision
  • 7.DDWith only medium-sized cations; sheets of edge-sharing octahedraGroup
  • 7.DD.07LlantenesiteSpecies

Literature, links & citation

Citations
  1. 2019Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839DOI: 10.1127/ejm/2019/0031-2839
  2. 2022(2022) Llantenesite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Llantenesite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/llantenesite-53356},
  note      = {Accessed 2026-05-11}
}