Mineralogy Database

Landesite Mineral Data

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General Landesite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)9Fe+++3(PO4)8(OH)3•9(H2O)
Help on Composition: Composition: Molecular Weight = 1,565.99 gm
   Magnesium    3.49 %  Mg    5.79 % MgO
   Manganese   23.68 %  Mn   30.58 % MnO
   Iron        10.70 %  Fe   13.76 % FeO
   Phosphorus  15.82 %  P    36.26 % P2O5
   Hydrogen     1.35 %  H    12.08 % H2O
   Oxygen      44.95 %  O
              ______        ______ 
              100.00 %       98.47 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: 9(Mn2+0.75)9(Mg0.25)Fe2+3(PO4)8(OH)3•9(H2O)
Help on Environment: Environment: Replacing reddingite in a complex granite pegmatite (Berry quarry, Maine, USA).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1930
Help on Locality: Locality: Berry quarry, Poland, Androscoggin Co., and the Emmons quarry, Greenwood, Oxford Co., Maine. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kenneth Knight Landes (1899-1984), Professor of Geology, University of Michigan, Ann Arbor, Michigan, USA, for his study of Maine pegmatites.
Help on Name Pronunciation: Name Pronunciation: Landesite + Pronunciation Say LANDESITE
Help on Synonym: Synonym: ICSD 31146
  PDF 16-603
 

Landesite Image

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  Landesite

Comments: Brown translucent crystalline crust of landesite.
Location: Hagendorf-Sud, Bayern, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Landesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9272:1:0.8328
Help on Cell Dimensions: Cell Dimensions: a = 9.43, b = 10.17, c = 8.47, Z = 1; V = 812.30 Den(Calc)= 3.20
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmna
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.207(1), 4.284(0.8), 5.096(0.8),
 

Physical Properties of Landesite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Brown.
Help on Density: Density: 3.026
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Streak: Streak: light brown
 

Optical Properties of Landesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.172 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.109 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2405,KC= 0.2051
Ncalc = 1.62 - 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.72, b=1.728, g=1.735, bire=0.0150
 

Calculated Properties of Landesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Landesite =3.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0059780582
Boson Index = 0.9940219418
Help on Photoelectric: Photoelectric: PELandesite = 10.03 barns/electron
U=PELandesite x rElectron Density= 31.43 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Landesite is Not Radioactive
 

Landesite Classification

Help on  Dana Class: Dana Class: 40.03.02.04 (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.02)Phosphoferrite Group
 
40.03.02.01 Phosphoferrite (Fe,Mn)3(PO4)2•3(H2O) Pmna 2/m 2/m 2/m
 
40.03.02.02 Kryzhanovskite MnFe2(PO4)2(OH)2•(H2O) Pbna 2/m 2/m 2/m
 
40.03.02.03 Reddingite Mn3(PO4)2•3(H2O) Pbna 2/m 2/m 2/m
 
40.03.02.04 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3•9(H2O) Pmna 2/m 2/m 2/m
 
40.03.02.05 Garyansellite (Mg,Fe)3(PO4)2(OH,O)•1,5(H2O) Pbna 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CC.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CC -With only medium-sized cations, RO4:H2O = 1:1.5
 
08.CC.05 Garyansellite (Mg,Fe)3(PO4)2(OH,O)•1,5(H2O) Pbna 2/m 2/m 2/m
 
08.CC.05 Kryzhanovskite MnFe2(PO4)2(OH)2•(H2O) Pbna 2/m 2/m 2/m
 
08.CC.05 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3•9(H2O) Pmna 2/m 2/m 2/m
 
08.CC.05 Phosphoferrite (Fe,Mn)3(PO4)2•3(H2O) Pmna 2/m 2/m 2/m
 
08.CC.05 Reddingite Mn3(PO4)2•3(H2O) Pbna 2/m 2/m 2/m
 

Other Landesite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Landesite :
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 Landesite Specimen Label here :

Landesite

(Mn,Mg)9Fe+++3(PO4)8(OH)3•9(H2O)
Dana No: 40.03.02.04 Strunz No: 08.CC.05
Locality:

 

Notes:

 

 
   
 


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