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Efremovite

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Formula:
(NH4)2Mg2(SO4)3
Hardness:
2
Crystal System:
Isometric
Name:
Named in honour of Dr. Ivan Antonovich Yefremov (1907–1972), Russian geologist and science fiction writer.
A hygroscopic ammonium magnesium sulphate that hydrates to boussingaultite at room temperature.

Compare also Unnamed (NH4-Mg Sulphate Hydrate).


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Classification of EfremoviteHide

Approved
7.AC.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
28.4.4.3

28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous
25.3.16

25 : Sulphates
3 : Sulphates of Mg

Physical Properties of EfremoviteHide

Hardness:

Optical Data of EfremoviteHide

Type:
Isotropic

Chemical Properties of EfremoviteHide

Formula:
(NH4)2Mg2(SO4)3

Crystallography of EfremoviteHide

Crystal System:
Isometric
Cell Parameters:
a = 9.99 Å
Unit Cell V:
997.00 ų (Calculated from Unit Cell)

Type Occurrence of EfremoviteHide

Synonyms of EfremoviteHide

Other Language Names for EfremoviteHide

Relationship of Efremovite to other SpeciesHide

Other Members of this group:
CalciolangbeiniteK2Ca2(SO4)3 Iso. 2 3 : P21 3
LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
ManganolangbeiniteK2Mn2(SO4)3Iso. 2 3 : P21 3

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.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
7.AC.35Aphthitalite(K,Na)3Na(SO4)2Trig.

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

28.4.4.1LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
28.4.4.2ManganolangbeiniteK2Mn2(SO4)3Iso. 2 3 : P21 3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.3.1KieseriteMgSO4 · H2OMon. 2/m
25.3.2SanderiteMgSO4 · 2H2OOrth. 2 2 2 : P21 21 21
25.3.3StarkeyiteMgSO4 · 4H2OMon. 2/m : P21/b
25.3.4PentahydriteMgSO4 · 5H2OTric.
25.3.5HexahydriteMgSO4 · 6H2OMon. 2/m : P2/m
25.3.6EpsomiteMgSO4 · 7H2OOrth. 2 2 2 : P21 21 21
25.3.7CaminiteMg7(SO4)5(OH)4 · H2OTet.
25.3.8VanthoffiteNa6Mg(SO4)4Mon. 2/m : P21/b
25.3.9BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
25.3.10KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
25.3.11LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
25.3.12UklonskoviteNaMg(SO4)F · 2H2OMon.
25.3.13LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
25.3.14LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
25.3.15PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
25.3.17Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
25.3.18PickeringiteMgAl2(SO4)4 · 22H2OMon. 2/m : P21/b

Other InformationHide

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 EfremoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 76: 299-300.
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 118: 84-87.

Internet Links for EfremoviteHide

Localities for EfremoviteHide

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.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
Zacek, V., Oplustil, S., Mayova, A. & Meyer, F. R. (1995): Die Mineralien von Kladno in Mittelböhmen, Tschechische Republik. Mineralien-Welt 6 (1), 13-30 (in German).
        • Libušin
Hyrsl J., Korbel P.; Tschechien & Slowakei, Mineralien und Fundstellen. Bode Verlag, 2008. Page 268-273
Germany
 
  • North Rhine-Westphalia
    • Aachen
      • Alsdorf
T. Witzke, F. de Wit, U. Kolitsch and G. Blaß (2015): Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. Chapter 7, 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.
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
Hungary
 
  • Baranya Co.
    • Mecsek Mts
      • Komló
Geoda 2007/1
      • Pécs
Szakáll, S. & Kristály, F. (2008): Ammonium sulphates from burning coal dumps at Komló and Pécs-Vasas, Mecsek Mts., South Hungary. Mineralogia, Special Papers, Vol. 32 (2nd Central-European Mineralogical Conference 2008 (CEMC)), 154.
Japan
 
  • Hokkaido
    • Sorachi Province
      • Mikasa City
Shimobayashi, N., Ohnishi, M., & Miura, H. (2011). Ammonium sulfate minerals from Mikasa, Hokkaido, Japan: boussingaultite, godovikovite, efremovite and tschermigite. Journal of mineralogical and petrological sciences, 106(3), 158-163.
Poland
 
  • Upper Silesia (Śląskie)
    • Rybnik District
      • Czerwionka-Leszczyny Commune
Parafiniuk, J. and Kruszewski, Ł. (2009): Ammonium minerals from burning coal-dumps of the Upper Silesian Coal Basin (Poland). Geol. Quart., 53, 341-356. http://www.pgi.gov.pl/images/stories/G_Q/53_3/parafiniuk.pdf]
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., M. Kotrly, and T. Nisanbajev (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
          • Kopeisk
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Tajikistan
 
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Zeravshan Range
      • Yagnob River
D.I.Belakovskiy data
Lapis 17(2), 39 (1992)
Mineral and/or Locality  
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