Pseudolaueite Mineral Data
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 % Fe2 O3
Phosphorus 11.99 % P 27.47 % P2 O5
Hydrogen 3.12 % H 27.89 % H2 O
Oxygen 52.64 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mn2+ Fe3+ 2 (PO4 )2 (OH)2 •7(H2 O)
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 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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 9.926(1), 5.869(0.7), 3.472(0.4),
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:
PEPseudolaueite = 9.56 barns/electronU=PEPseudolaueite x r Electron 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
Search for Pseudolaueite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Pseudolaueite :
Ask about Pseudolaueite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
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:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.