Jonlarsenite
A valid IMA mineral species
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About Jonlarsenite
Jon Larsen..
Formula:
Al4Cu9
Specific Gravity:
6.979 (Calculated)
Crystal System:
Isometric
Name:
in honour of Jon Larsen (b. 1959), who played a pivotal role in the urban micrometeorite search.
Formerly here as: 'NMM/L2 (Al,Cu)-alloy'.
Known synthetic analogue (synthetic ordered γ-Al4Cu9).
Seems to be the first new mineral described from a micrometeorite (here: collected from the roof of an industrial building).
For chemical resemblance compare similar alloys: cupalite, khatyrkite, stolperite; and 'Unnamed (Al-Cu Alloy)'.
Due to their extremely small size and intergrowth with other phases, individual jonlarsenite crystals are only characterizable using high-resolution electron microscopy techniques.
Known synthetic analogue (synthetic ordered γ-Al4Cu9).
Seems to be the first new mineral described from a micrometeorite (here: collected from the roof of an industrial building).
For chemical resemblance compare similar alloys: cupalite, khatyrkite, stolperite; and 'Unnamed (Al-Cu Alloy)'.
Due to their extremely small size and intergrowth with other phases, individual jonlarsenite crystals are only characterizable using high-resolution electron microscopy techniques.
Unique Identifiers
Mindat ID:
488794
Long-form identifier:
mindat:1:1:488794:8
IMA Classification of Jonlarsenite
Approved
Approval year:
2025
Approval history:
IMA No. 2024-078a
Type description reference:
Bindi, L.; Kihle, J. B.; Cheng, G.; Hu, J.; Yao, N.; Ma, C.; Guan, Y.; Asimow, P. D.; Steinhardt, P. J. (2025) Jonlarsenite, Al₄Cu₉, a new intermetallic phase in the Al–Cu system discovered in a micrometeorite from Oslo, Norway. European Journal of Mineralogy, 37 (5). 783-791 doi:10.5194/ejm-37-783-2025
Classification of Jonlarsenite
1.AA.
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
A : Copper-cupalite family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
A : Copper-cupalite family
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Jlr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jonlarsenite
Transparency:
Opaque
Density:
6.979 g/cm3 (Calculated)
Chemistry of Jonlarsenite
Mindat Formula:
Al4Cu9
Elements listed:
Crystallography of Jonlarsenite
Crystal System:
Isometric
Class (H-M):
43m - Hextetrahedral
Space Group:
P43m
Cell Parameters:
a = 8.70(1) Å
Unit Cell V:
658.50 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.891 Å | (4) |
| 3.552 Å | (7) |
| 2.900 Å | (9) |
| 2.051 Å | (100) |
| 1.776 Å | (4) |
| 1.450 Å | (9) |
| 1.184 Å | (15) |
| 1.071 Å | (7) |
Reference:
Bindi, L.; Kihle, J. B.; Cheng, G.; Hu, J.; Yao, N.; Ma, C.; Guan, Y.; Asimow, P. D.; Steinhardt, P. J. (2025) Jonlarsenite, Al₄Cu₉, a new intermetallic phase in the Al–Cu system discovered in a micrometeorite from Oslo, Norway. European Journal of Mineralogy, 37 (5). 783-791 doi:10.5194/ejm-37-783-2025
Comments:
Calculated X-ray powder diffraction data for jonlarsenite
Type Occurrence of Jonlarsenite
General Appearance of Type Material:
elongated spherule approximately 200 µm in diameter, characterised by a dark grey colour and a markedly scoriaceous surface featuring vesicles.
subhedral to anhedral grains up to approximately 2 µm in maximum dimension
subhedral to anhedral grains up to approximately 2 µm in maximum dimension
Place of Conservation of Type Material:
the collections of the Natural History Museum, University of
Oslo, Postboks 1172, Blindern, 0318 Oslo, Norway, registration number KNR 44452
Oslo, Postboks 1172, Blindern, 0318 Oslo, Norway, registration number KNR 44452
Geological Setting of Type Material:
which was found on 15 August 2022 on the roof of a modern industrial facility near Skedsmokorset, just north of Oslo. The building, operated by Bertel O. Steen Logistics, was constructed in 2017–2018, ensuring a well-constrained temporal window for micrometeorite accumulation.
the formation of jonlarsenite likely reflects high-temperature redox processes that occurred either during parent body alteration or, more plausibly, during peculiar hypervelocity impact events in space.
the formation of jonlarsenite likely reflects high-temperature redox processes that occurred either during parent body alteration or, more plausibly, during peculiar hypervelocity impact events in space.
Associated Minerals at Type Locality:
Reference:
Bindi, L.; Kihle, J. B.; Cheng, G.; Hu, J.; Yao, N.; Ma, C.; Guan, Y.; Asimow, P. D.; Steinhardt, P. J. (2025) Jonlarsenite, Al₄Cu₉, a new intermetallic phase in the Al–Cu system discovered in a micrometeorite from Oslo, Norway. European Journal of Mineralogy, 37 (5). 783-791 doi:10.5194/ejm-37-783-2025
Synonyms of Jonlarsenite
Other Language Names for Jonlarsenite
Dutch:Jonlarseniet
Related Minerals - Strunz-mindat Grouping
| 1.AA. | Pratesiite | AgCuTe2 |
| 1.AA.05 | Native Lead | Pb |
| 1.AA.05a | Auricupride Subgroup | |
| 1.AA.05 | Native Nickel | Ni |
| 1.AA.05 | Native Silver | Ag |
| 1.AA.05 | 'UM2004-08-E:AuCuPd' | Cu2PdAu |
| 1.AA.05 | 'UM1991-06-E:AuCu' | Au3Cu |
| 1.AA.05 | Native Aluminium | Al |
| 1.AA.05 | Steinhardtite | Al0.38Ni0.32Fe0.30 |
| 1.AA.05 | Native Gold | Au |
| 1.AA.05 | Native Copper | Cu |
| 1.AA.05 | Copper Group | |
| 1.AA.10a | Cuproauride | Cu3Au |
| 1.AA.10b | Tetra-auricupride | AuCu |
| 1.AA.10a | Auricupride | Cu3Au |
| 1.AA.10 | Nickel Group | |
| 1.AA.15 | Anyuiite | AuPb2 |
| 1.AA.15 | Novodneprite | AuPb3 |
| 1.AA.15 | 'UM1985-02-E:AlZn' | (Zn,Cu)Al2 |
| 1.AA.15 | Khatyrkite | (Cu,Zn)Al2 |
| 1.AA.20 | Cupalite | (Cu,Zn)Al |
| 1.AA.25 | Hunchunite | Au2Pb |
| 1.AA.30 | Stolperite | AlCu |
| 1.AA.35 | Hollisterite | Al3Fe |
| 1.AA.40 | Icosahedrite | Al63Cu24Fe13 |
| 1.AA.45 | Kryachkoite | (Al,Cu)6(Fe,Cu) |
| 1.AA.50 | Proxidecagonite | Al34Ni9Fe2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Jonlarsenite
mindat.org URL:
https://www.mindat.org/min-488794.html
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References for Jonlarsenite
Reference List:
Arnberg, L., Westman, S. (1978) Crystal perfection in a noncentrosymmetric alloy. Refinement and test of twinning of the γ-Cu9Al4structure. Acta Crystallographica Section A, 34 (3) 399-404 doi:10.1107/s0567739478000807
Gaudry, É.; Shukla, A. K.; Duguet, T.; Ledieu, J.; deWeerd, M.-C.; Dubois, J.-M.; Fournée, V. (2010) Structural investigation of the (110) surface of γ-Al4Cu9. Physical Review B, 82 (8). 085411 doi:10.1103/physrevb.82.085411
Kwon, J., Thuinet, L., Avettand-Fènoël, M.-N., Legris, A., Besson, R. (2014) Point defects and formation driving forces of complex metallic alloys: Atomic-scale study of Al4Cu9. Intermetallics, 46. 250-258 doi:10.1016/j.intermet.2013.11.023
Bindi, L.; Kihle, J. B.; Cheng, G.; Hu, J.; Yao, N.; Ma, C.; Guan, Y.; Asimow, P. D.; Steinhardt, P. J. (2025) Jonlarsenite, Al₄Cu₉, a new intermetallic phase in the Al–Cu system discovered in a micrometeorite from Oslo, Norway. European Journal of Mineralogy, 37 (5). 783-791 doi:10.5194/ejm-37-783-2025
Localities for Jonlarsenite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Norway (TL) | |
| Bindi et al. (2025) +1 other reference |
NMM/L2 micrometeorite, Berger, Skedsmo, Lillestrøm, Akershus, Norway