Bonaccorsiite

KK2Na3(Al6Si36)O84
IMA status
  • Approved
  • Pending publication
IMA symbol
Bcs
IMA approved
2025
Also known as
  • Bonaccorsiiet
  • IMA2025-028
  • Phase 430

Where it forms, where it's found

Type locality
Pfaffenberg hill
  1. Waldheim
  2. Mittelsachsen
  3. Saxony
  4. Germany

51.0686°, 13.0153°

2recorded occurrences
Source · OpenStreetMap

Crystallography

Crystal system
Hexagonal
Space group
#123
Cell parameters
a = 17.023(5) Å · c = 15.580(7) Å
Comment

space group P6/mmc

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen8415.9991343.916
49.72%
14SiSiliconSilicon3628.0851011.060
37.40%
13AlAluminiumAluminium626.982161.892
5.99%
19KPotassiumPotassium339.098117.294
4.34%
11NaSodiumSodium322.99068.970
2.55%
Total2703.132100.00%

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

From Mindat formula

Synonyms

  • Bonaccorsiiet
  • IMA2025-028
  • Phase 430

In other languages

German
Bonaccorsiit

Classification

Strunz
10th ed.

9.FA

  • 9SilicatesClass
  • 9.FTektosilicates without zeolitic H2ODivision
  • 9.FATektosilicates without additional non-tetrahedral anionsGroup
  • 9.FABonaccorsiiteSpecies

Literature, links & citation

Citations
  1. Mugnaioli, E., Lorenzon, S., Ferrero, S., Borriello, R., Borghini, A., Biagioni, C., Fuchs, R., Wirth, R., Schreiber, A. and Grew, E.S. (2025) Bonaccorsiite, IMA 2025- 028. CNMNC Newsletter 87, Mineralogical Magazine, 89, https://doi.org/
  2. 2021Gianola, Omar, Bartoli, Omar, Ferri, Fabio, Galli, Andrea, Ferrero, Silvio, Capizzi, Luca S., Liebske, Christian, Remusat, Laurent, Poli, Stefano, Cesare, Bernardo (2021) Anatectic melt inclusions in ultra high temperature granulites. Journal of Metamorphic Geology, 39 (3) 321-342 doi:10.1111/jmg.12567DOI: 10.1111/jmg.12567
  3. 2021Ferrero, Silvio, Ague, Jay J., O’Brien, Patrick J., Wunder, Bernd, Remusat, Laurent, Ziemann, Martin A., Axler, Jennifer (2021) High-pressure, halogen-bearing melt preserved in ultrahigh-temperature felsic granulites of the Central Maine Terrane, Connecticut (U.S.A.) American Mineralogist, 106 (8) 1225-1236 doi:10.2138/am-2021-7690DOI: 10.2138/am-2021-7690
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Bonaccorsiite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/bonaccorsiite-494654},
  note      = {Accessed 2026-05-11}
}