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About AluminopyracmoniteHide

Colourless to white
Specific Gravity:
Crystal System:
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.

Classification of AluminopyracmoniteHide

Approval Year:

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations

Physical Properties of AluminopyracmoniteHide

Colourless to white
not reported
None Observed
None observed
2.12(1) g/cm3 (Measured)    2.143 g/cm3 (Calculated)

Optical Data of AluminopyracmoniteHide

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.
Surface Relief:

Chemical Properties of AluminopyracmoniteHide

Common Impurities:

Crystallography of AluminopyracmoniteHide

Crystal System:
Class (H-M):
3 - Rhombohedral
Space Group:
Cell Parameters:
a = 15.0324(8) Å, c = 8.8776(5) Å
a:c = 1 : 0.591
Unit Cell V:
1737.3 ų
elongated hexagonal prisms, in aggregates
not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
7.469 Å(67)
4.289 Å(45)
4.187 Å(27)
3.336 Å(100)
3.288 Å(60)
2.824 Å(29)
2.796 Å(26)
2.748 Å(21)

Type Occurrence of AluminopyracmoniteHide

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:

Synonyms of AluminopyracmoniteHide

Related Minerals - Nickel-Strunz GroupingHide

7.AC.Acmonidesite(NH4,K,Pb)8NaFe2+4(SO4)5Cl8Orth. 2 2 2 : C2 2 21
7.AC.05VanthoffiteNa6Mg(SO4)4Mon. 2/m : P21/b
7.AC.08Pyracmonite(NH4)3Fe(SO4)3Trig. 3m : R3c
7.AC.10LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
7.AC.10ManganolangbeiniteK2Mn2(SO4)3Iso. 2 3 : P21 3
7.AC.15YavapaiiteKFe(SO4)2Mon. 2/m : B2/m
7.AC.15EldfelliteNaFe3+(SO4)2Mon. 2/m : B2/m
7.AC.20Godovikovite(NH4)Al(SO4)2Trig. 3 2 : P3 2 1
7.AC.20Sabieite(NH4)Fe3+(SO4)2Trig. 3 2 : P3 2 1
7.AC.25ThénarditeNa2SO4Orth. mmm (2/m 2/m 2/m) : Fddd
7.AC.30MetathénarditeNa2SO4Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc

Fluorescence of AluminopyracmoniteHide

Other InformationHide

IR Spectrum:
NH4+ [cm-1]: 3208 vs), 3048(s), 1421(vs)
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.

References for AluminopyracmoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Campostrini, I. and Castellano, C. (2013) Aluminopyracmonite, IMA 2012-075. CNMNC Newsletter No. 15, February 2013, page 9; Mineralogical Magazine: 77: 112.
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; in: Belakovskiy, D.I., Cámara, F., Gagne, O.C., Uvarova, Y. (2015): New mineral names. American Mineralogist: 100: 2352-2362

Internet Links for AluminopyracmoniteHide

Localities for AluminopyracmoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • North Rhine-Westphalia
    • Cologne
      • Aachen
        • Alsdorf
Witzke, T., de Wit, F., Kolitsch, U. and Blaß, G. (2015): Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. Chapter 7, pp. 203-240, in: Stracher, G. B., Prakash, A. and Sokol, E. V.: Coal and Peat Fires: A Global Perspective, Volume 3: Case Studies - Coal Fires, Elsevier, 786 pp.
  • Baranya County
    • Pécs
collector: Gábor Koller, Dávid Szabó, EDS: Zsolt Bendő, FTIR, XRD: Anatoly Kasatkin
Italy (TL)
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Demartin, F., Campostrini, I. and Castellano, C. (2013) Aluminopyracmonite, IMA 2012-075. CNMNC Newsletter No. 15, February 2013, page 9; Mineralogical Magazine, 77, 112.
  • Silesian Voivodeship
    • Rybnik Co.
      • Gmina Czerwionka-Leszczyny
Ł. Kruszewski (PXRD data)
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