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About PyracmoniteHide

colorless to white
Specific Gravity:
Crystal System:
The name is after the Greek words πνρ = “fire” and ακμων = “anvil”; it recalls the mythical Hephaistos’s workshop, which allegedly was located on the Island of Vulcano
Closely related to aluminopyracmonite (chemically, the Al analogue). The ammonium analogue of 'Unnamed (Na-Fe Sulphate)' (both trigonal but not isostructural).

Well-known also as a synthetic compound.

Classification of PyracmoniteHide

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

4 : Miscellaneous

Physical Properties of PyracmoniteHide

colorless to white
None Observed
None observed
2.22(1) g/cm3 (Measured)    2.228 g/cm3 (Calculated)

Optical Data of PyracmoniteHide

Average RI = 1.562

Chemical Properties of PyracmoniteHide


Crystallography of PyracmoniteHide

Crystal System:
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
Cell Parameters:
a = 15.2171(14) Å, c = 8.9323(8) Å
a:c = 1 : 0.587
Unit Cell V:
1,791.26 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
7.596 (100)
4.384 (5)
4.358 (23)
4.247 (5)
3.371 (26)
3.320 (30)
2.863 (8)
2.829 (14)

Type Occurrence of PyracmoniteHide

General Appearance of Type Material:
aggregates of colorless to white elongate hexagonal prismatic crystals up to 0.2 mm in length
Place of Conservation of Type Material:
Reference Collection of the Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università degli Studi di Milano, specimen number 2008–04.
Geological Setting of Type Material:
medium-temperature (~250°C) intracrater fumarole developed on a pyroclastic breccia
Associated Minerals at Type Locality:

Synonyms of PyracmoniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Ammonioalunite1 photo of Pyracmonite associated with Ammonioalunite on mindat.org.
Alunite1 photo of Pyracmonite associated with Alunite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.AC.Aluminopyracmonite(NH4)3Al(SO4)3Trig. 3 : R3
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.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

Related Minerals - Dana Grouping (8th Ed.)Hide,Fe3+)(SO4)4O2Tric. 1 : P1

Fluorescence of PyracmoniteHide

Other InformationHide

The mineral is not hygroscopic and is 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 PyracmoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ciriotti, M.E., Fascio, L. & Pasero, M. (2009): Italian Type Minerals. Edizioni Plus, Università di Pisa, Pisa, Italy, 357 pp.
DeMartin, F., Gramaccioli, C. M., and Campostrini, I. (2010): Pyracmonite (NH4)3Fe(SO4)3 from La Fossa crater, Vulcano, Aeolian islands, Italy. Canadian Mineralogist 48:307-313

Internet Links for PyracmoniteHide

Localities for PyracmoniteHide

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
    • Aachen
      • Alsdorf
Blaß, G. and Strehler, H. (1993): Mineralbildungen in einer durch Selbstentzündung brennenden Bergehalde des Aachener Steinkohlenreviers. Mineralien-Welt 4 (4), 35-42. (in German); 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.
  • Saxony
    • Dresden
      • Freital
Witzke, T. (1990): Sekundärminerale und Haldenbrandminerale des Döhlener Beckens.- Diplomarbeit, Bergakademie Freiberg, Sektion Mineralogie/Geochemie [as unnamed mineral]; Witzke, T. (2012): Neubestimmungen von Fundstellen in Sachsen: Pyracmonit, Philipsbornit, Mottramit, Mansfieldit, Hydrocerussit und weitere. Aufschluss, 63, 295-300.
  • Baranya
    • Mecsek Mts
      • Pécs
Italy (TL)
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Canadian Mineralogist 48,307-313(2010)
  • Ohio
    • Huron Co.
      • Huron River
Dr Pete Richards
Mineral and/or Locality  
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