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Aluminopyracmonite

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About AluminopyracmoniteHide

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.



Classification of AluminopyracmoniteHide

Approved
Approval Year:
2012
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

Physical Properties of AluminopyracmoniteHide

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 AluminopyracmoniteHide

Type:
Uniaxial (-)
RI values:
nω = 1.545() 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:
Low

Chemical Properties of AluminopyracmoniteHide

Formula:
(NH4)3Al(SO4)3
Common Impurities:
K,(Fe)

Crystallography of AluminopyracmoniteHide

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 ų
Z:
6
Morphology:
elongated hexagonal prisms, in aggregates
Twinning:
not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.469 (67)
4.289 (45)
4.187 (27)
3.336 (100)
3.288 (60)
2.824 (29)
2.796 (26)
2.748 (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.10Efremovite(NH4)2Mg2(SO4)3Iso.
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
7.AC.35Aphthitalite(K,Na)3Na(SO4)2Trig.

Fluorescence of AluminopyracmoniteHide

Other InformationHide

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.

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.
Germany
 
  • North Rhine-Westphalia
    • 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.
Hungary
 
  • Baranya Co.
    • Mecsek Mts
      • 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.
Poland
 
  • Upper Silesia (Śląskie)
    • Rybnik District
      • Czerwionka-Leszczyny Commune
Ł. Kruszewski (PXRD data)
Mineral and/or Locality  
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