Pilipenkoite

KCu(AsO4) · H2O
IMA status
  • Approved
  • Pending publication
IMA symbol
Plp
Also known as
  • Pilipenkoiet

Where it forms, where it's found

Type locality
Arsenatnaya fumarole
  1. Second scoria cone
  2. Northern Breakthrough (North Breach)
  3. Great Fissure eruption (Main Fracture)
  4. Tolbachik Volcanic field
  5. Milkovsky District
  6. Kamchatka Krai
  7. Russia

55.6833°, 160.2333°

1recorded occurrences
Source · OpenStreetMap

Safety & handling

Crystallography

Crystal system
Monoclinic
Space group
P21/c
Cell parameters
a = 10.720(1) Å · b = 6.9733(6) Å · c = 6.8383(7) Å
Cell angles
β = 93.535(6) °
Ratio a:b:c
1 : 0.650 : 0.638

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen515.99979.995
30.82%
33AsArsenicArsenic174.92274.922
28.86%
29CuCopperCopper163.54663.546
24.48%
19KPotassiumPotassium139.09839.098
15.06%
1HHydrogenHydrogen21.0082.016
0.78%
Total259.577100.00%

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

From IMA formula

Synonyms

  • Pilipenkoiet

In other languages

German
IMA 2022-017 · Pilipenkoit

Classification

Strunz
10th ed.

7.CA

  • 7SulfatesClass
  • 7.CSulfates (selenates, etc.) without additional anions, with H2ODivision
  • 7.CAWith small cationsGroup
  • 7.CAPilipenkoiteSpecies

Literature, links & citation

Citations
  1. 2022Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 68. European Journal of Mineralogy, 34 (5) 385-391 doi:10.5194/ejm-34-385-2022 DOI: 10.5194/ejm-34-385-2022
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Pilipenkoite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/pilipenkoite-56160},
  note      = {Accessed 2026-05-11}
}