Jakobssonite
A valid IMA mineral species
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Formula:
CaAlF5
Colour:
White
Lustre:
Earthy
Specific Gravity:
2.89 (Calculated)
Crystal System:
Monoclinic
Name:
The name honours Sveinn Peter Jakobsson (20 July 1939, Reykjavík, Iceland - 12 July 2016, Iceland), volcanologist at the Icelandic Institute of Natural History, who was the first person to recognize it.
It is known as a synthetic phase (Hemon & Courbion, 1991). Jakobsson et al. (2008) referred to it as "mineral HA". In the IMA list of unnamed minerals it is listed in the invalid minerals under the code UM2008-//-?[5].
Unique Identifiers
Mindat ID:
42796
Long-form identifier:
mindat:1:1:42796:6
GUID
(UUID V4):
(UUID V4):
800d5b75-cb5c-442e-8394-8440c72f3245
IMA Classification of Jakobssonite
Approved
Approval year:
2011
First published:
2012
Classification of Jakobssonite
3.CD.15
3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
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 |
---|---|---|
Jak | 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 Jakobssonite
Chemistry of Jakobssonite
Mindat Formula:
CaAlF5
Elements listed:
Crystallography of Jakobssonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 8.601(1) Å, b = 6.2903(6) Å, c = 7.2190(7) Å
β = 114.61(1)°
β = 114.61(1)°
Ratio:
a:b:c = 1.367 : 1 : 1.148
Unit Cell V:
355.09 ų
Z:
4
Morphology:
Acicular crystals which are probably elongated along [100]; fragile crusts.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0010259 | Jakobssonite | Hemon A, Courbion G (1991) Refinement of the room-temperature structure of alpha-CaAlF5 _cod_database_code 1000300 Acta Crystallographica C47 1302-1303 | 1991 | 0 | 293 | ||
0019194 | Jakobssonite | Balic-Zunic T, Garavelli A, Mitolo D, Acquafredda P, Leonardsen E (2012) Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland Mineralogical Magazine 76 751-760 | 2012 | Hekla volcano, Iceland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.91 Å | (18) |
3.92 Å | (76) |
3.15 Å | (68) |
3.13 Å | (100) |
2.270 Å | (22) |
1.957 Å | (21) |
1.814 Å | (20) |
1.805 Å | (22) |
Comments:
Sample from Hekla volcano, Iceland.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Jakobssonite
Co-Type Localities:
General Appearance of Type Material:
Acicular crystals up to 50 µm long. Also as a white overgrowth on a yellowish base of massive ralstonite, anhydrite and jarosite which together form a 2-3 cm thick crust on altered scoria.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Icelandic Institute of Natural History, Reykjavık, Iceland, sample number NI 12256 (Eldfell). A cotype sample has the number NI 15511(Hekla).
Geological Setting of Type Material:
Fumarole at ~230ºC.
Associated Minerals at Type Locality:
Reference:
Balić-Žunić, T., Garavelli, A., Mitolo, D., Acquafredda, P., Leonardsen, E. (2012) Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland. Mineralogical Magazine: 76: 751-760.
Synonyms of Jakobssonite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
3.CD.05 | Rosenbergite | AlF[F0.5(H2O)0.5]4 · H2O |
3.CD.05 | Topsøeite | FeF[F0.5(H2O)0.5]4 · H2O |
3.CD.10 | Prosopite | CaAl2F4[(OH)4-xFx] |
Fluorescence of Jakobssonite
Does not fluoresce in LW UV
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 Jakobssonite
mindat.org URL:
https://www.mindat.org/min-42796.html
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References for Jakobssonite
Reference List:
Hemon, A., Courbion, G. (1991) Refinement of a room-temperature structure of α-CaAlF5. Acta Crystallographica Section C Crystal Structure Communications, 47 (6) 1302-1303 doi:10.1107/s0108270190013956
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Localities for Jakobssonite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Iceland | |
| Günter Frenz collection +1 other reference |
| Balić-Žunić et al. (2016) |
| Williams et al. (2011) +1 other reference |
| Williams et al. (2011) +2 other references |
Russia | |
| Pekov et al. (2015) |
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