Pseudolaueite Mineral Data

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General Pseudolaueite Information

Chemical Formula:

Mn++Fe+++2(PO4)2(OH)2•7-8(H2O)

Composition:

Molecular Weight = 516.70 gm

Manganese 10.63 % Mn 13.73 % MnO

Iron 21.62 % Fe 30.91 % Fe₂O₃

Phosphorus 11.99 % P 27.47 % P₂O₅

Hydrogen 3.12 % H 27.89 % H₂O

Oxygen 52.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂•7(H₂O)

Environment:

As incrustations and replacements of stewartite crystals in a complex zoned granite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Hagendorf, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for false and its relation to laueite, as it is not that species.

Name Pronunciation:

Pseudolaueite + Pronunciation

Synonym:

ICSD 15205

PDF 12-294

Pseudolaueite Image

Images:

Pseudolaueite

Comments: Brownish yellow crystals of pseudolaueite.
Location: Hagendorf, Bavaria, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Pseudolaueite Crystallography

Axial Ratios:

a:b:c =1.2987:1:1.3723

Cell Dimensions:

a = 9.647, b = 7.428, c = 10.194, Z = 2; beta = 104.63° V = 706.80 Den(Calc)= 2.43

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 9.926(1), 5.869(0.7), 3.472(0.4),

Crystal Structure:

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Baur W H , American Mineralogist , 54 (1969) p.1312-1323, A comparison of the crystal structures of pseudolaueite and laueite

Physical Properties of Pseudolaueite

Color:

Orange.

Density:

2.463

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pseudolaueite

Gladstone-Dale:

CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2691,KPDmeas= 0.2655,KC= 0.2695
Ncalc = 1.65 - 1.66

Optical Data:

Biaxial (+), a=1.626, b=1.65, g=1.686, bire=0.0600, 2V(Calc)=80, 2V(Meas)=80.

Calculated Properties of Pseudolaueite

Electron Density:

Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Pseudolaueite =2.43 gm/cc.

Fermion Index:

Fermion Index = 0.0048401477
Boson Index = 0.9951598523

Photoelectric:

PE_{Pseudolaueite}= 9.56 barns/electron
U=PE_{Pseudolaueite} x rElectron Density= 23.30 barns/cc.

Radioactivity:

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

Pseudolaueite Classification

Dana Class:

42.11.10.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.10)Laueite Group

42.11.10.01 Laueite MnFe2(PO4)2(OH)2•8(H2O) P1 1

42.11.10.02 Stewartite MnFe2(PO4)2(OH)2•8(H2O) P1 1

42.11.10.03 Pseudolaueite MnFe2(PO4)2(OH)2•7-8(H2O) P 2₁/a 2/m

42.11.10.04 Ushkovite MgFe2(PO4)2(OH)2•8(H2O) P1 1

42.11.10.05 Ferrolaueite! FeFe2(PO4)2(OH)2•8(H2O) Tri

Strunz Class:

08.DC.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.30 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Ferrolaueite! FeFe2(PO4)2(OH)2•8(H2O) Tri

08.DC.30 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Laueite MnFe2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1

08.DC.30 Pseudolaueite MnFe2(PO4)2(OH)2•7-8(H2O) P 2₁/a 2/m

08.DC.30 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Stewartite MnFe2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Ushkovite MgFe2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1

Other Pseudolaueite 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 Pseudolaueite :
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 Pseudolaueite Specimen Label here :

Pseudolaueite

Mn++Fe+++2(PO4)2(OH)2•7-8(H2O)
Dana No: 42.11.10.03 Strunz No: 08.DC.30
Locality:

Notes: