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Langbeinite

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Hattorf Potash Works, Phillippsthal, Werra Valley, North Hesse, Hesse, Germany
© 2005 - MMI

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Formula:
K
 
2
Mg
 
2
(SO
 
4
)
 
3
System:IsometricColour:Colorless, white, pale ...
Hardness:3½ - 4
Name:After A. Langbein of Leopoldshall, Germany.


Langbeinite Group

Piezoelectric.

Classification of Langbeinite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/A.03-10
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:28.4.4.1

28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous
Hey's CIM Ref.:25.3.13

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

Type Locality:Wilhelmshall, Halberstadt, Saxony-Anhalt, Germany
Year of Discovery:1891

Occurrences of Langbeinite

Geological Setting:Salt deposits.

Physical Properties of Langbeinite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless, white, pale tinges; colourless in transmitted light
Hardness (Mohs):3½ - 4
Tenacity:Brittle
Cleavage:None Observed
Fracture:Conchoidal
Density (measured):2.83 g/cm3
Density (calculated):2.77 g/cm3

Crystallography of Langbeinite

Crystal System:Isometric
Class (H-M):2 3 - Tetartoidal
Space Group:P21 3
Cell Parameters:a = 9.92Å
Unit Cell Volume:V 976.19 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals rare. Usually disseminated grains, nodular or massive aggregates.

Optical Data of Langbeinite

Type:Isotropic

Chemical Properties of Langbeinite

Formula:
K
 
2
Mg
 
2
(SO
 
4
)
 
3
Essential elements:K, Mg, O, S
All elements listed in formula:K, Mg, O, S
Analytical Data:Slowly water soluble.
Relationship of Langbeinite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
7.AC.05Vanthoffite
Na
 
6
Mg(SO
 
4
)
 
4
7.AC.10Efremovite
(NH
 
4
)
 
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
25.3.14Leonite
K
 
2
Mg(SO
 
4
)
 
2
·4H
 
2
O
25.3.15Picromerite
K
 
2
Mg(SO
 
4
)
 
2
·6H
 
2
O
25.3.16Efremovite
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
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 Langbeinite
Other Languages:
German:Langbeinit
Russian:Лангбейнит
Spanish:Langbeinita
Other Information
Thermal Behaviour:Melting Point = 930°.
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 Langbeinite
Reference List:Zuckschwerdt (1891) Zeitschrift für anorganische und allgemeine Chemie, Hamburg, Leipzig: 356. 



Luedecke (1898) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 29: 255.



Sachs (1902) Sitzungsberichte der

Akademie der Wissenschaften, Berlin: 376.



Nacken (1907) Gesellschaft der Wissenschaften zu Göttingen, Nachr.: 602.



Görgey (1909) Mineralogische und petrographische Mitteilungen, Vienna: 28: 334.



Gossner and Koch (1931) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 80: 455.



Ramsdell (1935) American Mineralogist: 20: 569.



Bond (1943) Bell Systems technology Journal: 22: 145.



Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 434-435.



Neues Jahrbuch für Mineralogie, Monatshefte (1979): 182-188.
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