Aluminopyracmonite
A valid IMA mineral species
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About Aluminopyracmonite
Formula:
(NH4)3Al(SO4)3
Colour:
Colourless to white
Lustre:
Vitreous
Specific Gravity:
2.12
Crystal System:
Trigonal
Name:
Named as the chemical (but not structural) Al analogue of pyracmonite.
Closely related to pyracmonite (chemically the ferric Fe analogue; not isostructural). Chemically related to godovikovite; ammonioalunite (basic salt, anhydrous); huizingite-(Al) and tschermigite (hydrated minerals). Admixture of K suggests a solid solution with hypothetical K3Al(SO4)3 end-member.
Crystal structure contains two types of Al octahedra, that share all corners with sulfate tetrahedra in two possible conformations and occupation of 2/3 or 1/3, thus forming infinite Al(SO4)3 chains. NH4+ ions are located in voids between chains, extending along [001]; they are involved in hydrogen bonding with oxygen of sulfate group not taking part in Al coordinating.
Crystal structure contains two types of Al octahedra, that share all corners with sulfate tetrahedra in two possible conformations and occupation of 2/3 or 1/3, thus forming infinite Al(SO4)3 chains. NH4+ ions are located in voids between chains, extending along [001]; they are involved in hydrogen bonding with oxygen of sulfate group not taking part in Al coordinating.
Unique Identifiers
Mindat ID:
43521
Long-form identifier:
mindat:1:1:43521:1
GUID
(UUID V4):
(UUID V4):
264f4c82-8db3-4ae2-8b97-8212a29efce7
IMA Classification of Aluminopyracmonite
Approved
Approval year:
2012
First published:
2013
Classification of Aluminopyracmonite
7.AC.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Apyr | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Aluminopyracmonite
Vitreous
Colour:
Colourless to white
Streak:
White
Comment:
not reported
Cleavage:
None Observed
Fracture:
None observed
Density:
2.12(1) g/cm3 (Measured) 2.143 g/cm3 (Calculated)
Optical Data of Aluminopyracmonite
Type:
Uniaxial (-)
RI values:
nω = 1.545(3) nε = 1.532(3)
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemistry of Aluminopyracmonite
Mindat Formula:
(NH4)3Al(SO4)3
Common Impurities:
K,(Fe)
Crystallography of Aluminopyracmonite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 15.0324(8) Å, c = 8.8776(5) Å
Ratio:
a:c = 1 : 0.591
Unit Cell V:
1737.3 Ă
Âł
Z:
6
Morphology:
elongated hexagonal prisms, in aggregates
Twinning:
not observed
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) |
---|---|---|---|---|---|---|---|
0019924 | Aluminopyracmonite | Demartin F, Castellano C, Campostrini I (2013) Aluminopyracmonite, (NH4)3Al(SO4)3, a new ammonium aluminium sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy Mineralogical Magazine 77 443-451 | 2013 | La Fossa crater, Vulcano, Aeolian Islands, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.469 Ă | (67) |
4.289 Ă | (45) |
4.187 Ă | (27) |
3.336 Ă | (100) |
3.288 Ă | (60) |
2.824 Ă | (29) |
2.796 Ă | (26) |
2.748 Ă | (21) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45a : [Sulfates, arsenates, selenates, antimonates] | |
45b : [Other oxidized fumarolic minerals] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Aluminopyracmonite
General Appearance of Type Material:
aggregates of elongated hexagonal prisms up to 0.2 mm
Place of Conservation of Type Material:
Type material is deposited in the Reference Collection of the Dipartimento di Chimica, University of Milan, Milan, Italy, sample number 2012-01.
Geological Setting of Type Material:
La Fossa crater, Vulcano, Aeolian Islands, Italy: active intracrater fumarole within a pyroclastic breccia, T ~250 °C
Associated Minerals at Type Locality:
Reference:
Demartin, F., Castellano, C., Campostrini, I. (2013) Aluminopyracmonite, (NH4)3Al(SO4)3, a new ammonium aluminium sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine: 77(4): 443â451.
Synonyms of Aluminopyracmonite
Related Minerals - Strunz-mindat Grouping
7.AC. | Amgaite | Tl+32Te6+O6 |
7.AC.05 | Vanthoffite | Na6Mg(SO4)4 |
7.AC.08 | Pyracmonite | (NH4)3Fe(SO4)3 |
7.AC.10 | Efremovite | (NH4)2Mg2(SO4)3 |
7.AC.10 | Langbeinite | K2Mg2(SO4)3 |
7.AC.10 | Manganolangbeinite | K2Mn2(SO4)3 |
7.AC.10 | Ferroefremovite | (NH4)2Fe2+2(SO4)3 |
7.AC.15 | Yavapaiite | KFe(SO4)2 |
7.AC.15 | Eldfellite | NaFe3+(SO4)2 |
7.AC.20 | Godovikovite | (NH4)Al(SO4)2 |
7.AC.20 | Sabieite | (NH4)Fe3+(SO4)2 |
7.AC.20 | Steklite | KAl(SO4)2 |
7.AC.35 | Aphthitalite | (K,Na)3Na(SO4)2 |
7.AC.35 | Möhnite | (NH4)K2Na(SO4)2 |
7.AC.35 | Belomarinaite | KNa(SO4) |
7.AC.35 | Natroaphthitalite | KNa3(SO4)2 |
7.AC.40 | Itelmenite | Na4Mg3Cu3(SO4)8 |
7.AC.45 | Saranchinaite | Na2Cu(SO4)2 |
7.AC.50 | Majzlanite | K2Na(ZnNa)Ca(SO4)4 |
7.AC.60 | Philoxenite | (K,Na,Pb)4(Na,Ca)2(Mg,Cu)3(Fe3+0.5Al0.5)(SO4)8 |
7.AC.75 | Petrovite | Na12Cu2(SO4)8 |
Fluorescence of Aluminopyracmonite
none
Other Information
IR Spectrum:
NH4+ [cm-1]: 3208 vs), 3048(s), 1421(vs)
Notes:
not hygroscopic; stable in air
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 Aluminopyracmonite
mindat.org URL:
https://www.mindat.org/min-43521.html
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References for Aluminopyracmonite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) IMA Commission on New Minerals, Nomenclature and Classification. CNMNC Newsletter No. 15. Mineralogical Magazine, 77 (1) 1-12 doi:10.1180/minmag.2013.077.1.01
Demartin, F., Castellano, C., Campostrini, I. (2013) Aluminopyracmonite, (NH4)3Al(SO4)3, a new ammonium aluminium sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 77 (4) 443-451 doi:10.1180/minmag.2013.077.4.04
Localities for Aluminopyracmonite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
Czech Republic | |
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Germany | |
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Hungary | |
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Italy (TL) | |
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Poland | |
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La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy