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Efremovite

Big Photo

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

Show Efremovite Photos (2)
Formula:
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
System:IsometricHardness:2
Name:Named in honour of Dr. Ivan Antonovich Yefremov (1907–1972), Russian geologist and science fiction writer.


A hygroscopic ammonium magnesium sulphate that alters to boussingaultite.

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 Nos. 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

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,Fe)(SO
 
4
)
 
2
7.AC.20Sabieite
NH
 
4
Fe(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
[(OH)
 
4
|(SO
 
4
)
 
5
] · 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[F|SO
 
4
] · 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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    Localities for Efremovite

    (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
        • Kladno
    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
    Russia
     
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Chelyabinsk coal basin
            • Kopeisk
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Tajikistan
     
    • Viloyati Sogd (Viloyati Sughd)
      • joint of Zeravshan and Gissar Range
        • Yagnob River
    		Lapis 17(2), 39 (1992)
    D.I.Belakovskiy data
    Mineral and/or Locality
    Google
     
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