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Pyracmonite

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About PyracmoniteHide

Formula:
(NH4)3Fe(SO4)3
Colour:
colorless to white
Lustre:
Vitreous
Specific Gravity:
2.22
Crystal System:
Trigonal
Name:
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

Approved
Approval Year:
2008
7.AC.08

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
28.4.6.1

28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous

Physical Properties of PyracmoniteHide

Vitreous
Transparency:
Transparent
Colour:
colorless to white
Streak:
White
Cleavage:
None Observed
Fracture:
None observed
Density:
2.22(1) g/cm3 (Measured)    2.228 g/cm3 (Calculated)

Optical Data of PyracmoniteHide

Type:
Uniaxial
Comments:
Average RI = 1.562

Chemical Properties of PyracmoniteHide

Formula:
(NH4)3Fe(SO4)3

Crystallography of PyracmoniteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3c
Cell Parameters:
a = 15.2171(14) Å, c = 8.9323(8) Å
Ratio:
a:c = 1 : 0.587
Unit Cell V:
1,791.26 ų (Calculated from Unit Cell)
Z:
6

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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.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.

Related Minerals - Dana Grouping (8th Ed.)Hide

28.4.6.2AlumoklyuchevskiteK3Cu3(Al,Fe3+)(SO4)4O2Tric. 1 : P1

Fluorescence of PyracmoniteHide

Other InformationHide

Notes:
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.
Germany
 
  • 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.
Hungary
 
  • Baranya Co.
    • Mecsek Mts
      • Pécs
Collector:G.Koller,Identified:Szakáll-Fehér,2012
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Canadian Mineralogist 48,307-313(2010)
USA
 
  • Ohio
    • Huron Co.
      • Huron River
Dr Pete Richards
Mineral and/or Locality  
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