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Efremovite

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Big Photo

Ronneburg U deposit, Gera, Thuringia, Germany
© Thomas Witzke

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Formula:
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
System:IsometricHardness:2
Member of:Langbeinite Group
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).

Classification of Efremovite

IMA status:Approved
Strunz 8th edition ID:6/A.03-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:28.4.4.3

28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous
Hey's CIM Ref.:25.3.16

25 : Sulphates
3 : Sulphates of Mg
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Type Occurrence of Efremovite

Type Locality:Coal mine No. 43, Kopeisk, Chelyabinsk coal basin, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia
Year of Discovery:1989

Physical Properties of Efremovite

Hardness (Mohs):2

Crystallography of Efremovite

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

Optical Data of Efremovite

Type:Isotropic

Chemical Properties of Efremovite

Formula:
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
Essential elements:H, Mg, N, O, S
All elements listed in formula:H, Mg, N, O, S

Relationship of Efremovite to other Species

Member of:Langbeinite Group
Other Members of Group:

- +
Langbeinite
K
 
2
Mg
 
2
(SO
 
4
)
 
3
Manganolangbeinite
K
 
2
Mn
 
2
(SO
 
4
)
 
3
Related Minerals - Nickel-Strunz Grouping):

- +
7.AC.05Vanthoffite
Na
 
6
Mg(SO
 
4
)
 
4
7.AC.10Langbeinite
K
 
2
Mg
 
2
(SO
 
4
)
 
3
7.AC.10Manganolangbeinite
K
 
2
Mn
 
2
(SO
 
4
)
 
3
7.AC.15Yavapaiite
KFe(SO
 
4
)
 
2
7.AC.15Eldfellite
NaFe
3+
 
(SO
 
4
)
 
2
7.AC.20Godovikovite
(NH
 
4
)Al(SO
 
4
)
 
2
7.AC.20Sabieite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
7.AC.25Thenardite
Na
 
2
SO
 
4
7.AC.30Metathenardite
Na
 
2
SO
 
4
7.AC.35Aphthitalite
(K,Na)
 
3
Na(SO
 
4
)
 
2
Related Minerals - Hey's Index Grouping:

- +
25.3.1Kieserite
MgSO
 
4
 · H
 
2
O
25.3.2Sanderite
MgSO
 
4
 · 2H
 
2
O
25.3.3Starkeyite
MgSO
 
4
 · 4H
 
2
O
25.3.4Pentahydrite
MgSO
 
4
 · 5H
 
2
O
25.3.5Hexahydrite
MgSO
 
4
 · 6H
 
2
O
25.3.6Epsomite
MgSO
 
4
 · 7H
 
2
O
25.3.7Caminite
Mg
 
7
(SO
 
4
)
 
5
(OH)
 
4
 · H
 
2
O
25.3.8Vanthoffite
Na
 
6
Mg(SO
 
4
)
 
4
25.3.9Blödite
Na
 
2
Mg(SO
 
4
)
 
2
 · 4H
 
2
O
25.3.10Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
 · 5H
 
2
O
25.3.11Löweite
Na
 
12
Mg
 
7
(SO
 
4
)
 
13
25.3.12Uklonskovite
NaMg(SO
 
4
)F · 2H
 
2
O
25.3.13Langbeinite
K
 
2
Mg
 
2
(SO
 
4
)
 
3
25.3.14Leonite
K
 
2
Mg(SO
 
4
)
 
2
 · 4H
 
2
O
25.3.15Picromerite
K
 
2
Mg(SO
 
4
)
 
2
 · 6H
 
2
O
25.3.17Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
 · 6H
 
2
O
25.3.18Pickeringite
MgAl
 
2
(SO
 
4
)
 
4
 · 22H
 
2
O

Other Names for Efremovite

Synonyms:
Efremovite (of Shcherbakova and Bazhenova)IMA1987-033a
Other Languages:
German:Efremovit
Efremowit
Spanish:Efremovita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Efremovite

Reference List:

- +
American Mineralogist: 76: 299-300.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 118: 84-87.

Internet Links for Efremovite

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  • Raman and XRD data at RRUFF project
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    • Localities for Efremovite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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
     
    • 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, (in press).
    Poland
     
    • Upper Silesia (Śląskie)
      • Upper Silesian Coal Basin
        • Katowice area
    		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]
    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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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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