Landesite Mineral Data

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)

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Link to MinDat.org Location Data.

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

Optical Data:

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

Calculated Properties of Landesite

Electron Density:

r_electron=3.13 gm/cc
note: r_Landesite=3.20 gm/cc.

Fermion Index

Fermion Index = 0.00597
Boson Index = 0.99403

Photoelectric:

PE_Landesite= 10.03 barns/electron
U=PE_Landesite x r_electron= 31.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Landesite is Not Radioactive

Landesite Classification

Dana Class:

40.3.2.4 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.2)Dana Group

40.3.2.1 Phosphoferrite (Fe,Mn)3(PO4)2·3(H2O) Pmna 2/m 2/m 2/m

40.3.2.2 Kryzhanovskite MnFe2(PO4)2(OH)2·(H2O) Pbna 2/m 2/m 2/m

40.3.2.3 Reddingite Mn3(PO4)2·3(H2O) Pbna 2/m 2/m 2/m

40.3.2.4 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3·9(H2O) Pmna 2/m 2/m 2/m

40.3.2.5 Garyansellite (Mg,Fe)3(PO4)2(OH,O)·1,5(H2O) Pbna 2/m 2/m 2/m

Strunz Class:

VII/D.03-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.03 - Giniite - Schoonerite series

VII/D.03-05 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13·H2O P 2₁/n 2/m

VII/D.03-10 Giniite FeFe4(PO4)4(OH)2·2(H2O) P 2/a 2/m

VII/D.03-15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)·4(H2O) C cca 2/m 2/m 2/m

VII/D.03-20 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3·9(H2O) Pmna 2/m 2/m 2/m

VII/D.03-30 Schoonerite Fe2ZnMnFe(PO4)3(OH)2·9(H2O) Pmab 2/m 2/m 2/m

Other Landesite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Landesite

(Mn,Mg)9Fe+++3(PO4)8(OH)3·9(H2O)
Dana No: 40.3.2.4 Strunz No: VII/D.03-20
Locality:

Notes: