Landesite Mineral Data

General Landesite Information

Chemical Formula:

(Mn,Mg)9Fe+++3(PO4)8(OH)3•9(H2O)

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

Empirical Formula:

9(Mn²⁺_0.75)9(Mg_0.25)Fe²⁺₃(PO₄)₈(OH)₃•9(H₂O)

Environment:

Replacing reddingite in a complex granite pegmatite (Berry quarry, Maine, USA).

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Berry quarry, Poland, Androscoggin Co., and the Emmons quarry, Greenwood, Oxford Co., Maine. Link to MinDat.org Location Data.

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.

Name Pronunciation:

Landesite + Pronunciation

Synonym:

ICSD 31146

PDF 16-603

Landesite Image

Images:

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

Axial Ratios:

a:b:c =0.9272:1:0.8328

Cell Dimensions:

a = 9.43, b = 10.17, c = 8.47, Z = 1; V = 812.30 Den(Calc)= 3.20

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmna

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.207(1), 4.284(0.8), 5.096(0.8),

Crystal Structure:

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Moore P B , Araki T , Kampf A R , Mineralogical Magazine , 43 (1980) p.789-795, Nomenclature of the phosphoferrite structure type:, refinements of landesite and kryzhanovskite

Physical Properties of Landesite

Cleavage:

{???} Indistinct

Color:

Brown.

Density:

3.026

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Streak:

light brown

Optical Properties of Landesite

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

Optical Data:

Biaxial (-), a=1.72, b=1.728, g=1.735, bire=0.0150

Calculated Properties of Landesite

Electron Density:

Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Landesite =3.20 gm/cc.

Fermion Index:

Fermion Index = 0.0059780582
Boson Index = 0.9940219418

Photoelectric:

PE_Landesite= 10.03 barns/electron
U=PE_Landesite x rElectron Density= 31.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Landesite is Not Radioactive

Landesite Classification

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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Ask about Landesite here :
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Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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: