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Langbeinite Mineral Data

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General Langbeinite Information

Help on Chemical  Formula: Chemical Formula: K2Mg2(SO4)3
Help on Composition: Composition: Molecular Weight = 415.00 gm
   Potassium  18.84 %  K    22.70 % K2O
   Magnesium  11.71 %  Mg   19.42 % MgO
   Sulfur     23.18 %  S    57.88 % SO3
   Oxygen     46.26 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Mg2(SO4)3
Help on Environment: Environment: Principal ore of potash, mined from marine salt deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: Locality: Wilhelmshall, near Halberstadt; at Solvayhall, near Bernberg; from Hattord, Hesse, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for A. Langbein, of Leopoldshall [Stassfurt], Germany.
Help on Name Pronunciation: Name Pronunciation: Langbeinite + Pronunciation Say LANGBEINITE
Help on Synonym: Synonym: ICSD 100420
  PDF 19-975
 

Langbeinite Image

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  Langbeinite

Comments: Pale brownish pink crystalline aggregate of langbeinite.
Location: Carlsbad, Eddy County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Langbeinite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 9.9211, Z = 4; V = 976.52 Den(Calc)= 2.82
Help on Crystal System: Crystal System: Isometric - Tetartoidal H-M Symbol (2 3) Space Group: P 213
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 2.65(0.35), 4.05(0.25),
Help on Forms: Forms:

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Drag2 - Resize

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Help on Above

Forms: ( 1 0 2) ( 1 1 1) ( 1 1 1) ( 1 1 2) ( 0 0 1)

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Physical Properties of Langbeinite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Violet, Greenish, Gray, Yellowish.
Help on Density: Density: 2.83
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Phosphorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Langbeinite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1901,KPDmeas= 0.1894,KC= 0.1858
Ncalc = 1.52 - 1.53
Help on Optical Data: Optical Data: Isotropic, n=1.536.
 

Calculated Properties of Langbeinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Langbeinite =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELangbeinite = 3.54 barns/electron
U=PELangbeinite x relectron= 9.95 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 269.89 (Gamma Ray American Petroleum Institute Units)
Concentration of Langbeinite per GRapi unit = 0.37 (%)

Estimated Radioactivity from Langbeinite - barely detectable

 

Langbeinite Classification

Help on  Dana Class: Dana Class: 28.04.04.01 (28)Anhydrous Acid and Sulfates
  (28.04)with miscellaneous formulae
  (28.04.04)Langbeinite Series
 
28.04.04.01 Langbeinite K2Mg2(SO4)3 P 213 2 3
 
28.04.04.02 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3
 
28.04.04.03 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3
Help on  Strunz Class: Strunz Class: 07.AC.10 07 - SULFATES (SELENATES, TELLURATES)
  07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O
  07.AC -With medium-sized and large cations
 
07.AC.10 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3
 
07.AC.10 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3
 
07.AC.10 Langbeinite K2Mg2(SO4)3 P 213 2 3
 

Other Langbeinite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Langbeinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Langbeinite Specimen Label here :

Langbeinite

K2Mg2(SO4)3
Dana No: 28.04.04.01 Strunz No: 07.AC.10
Locality:

 

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