Pseudolaueite Mineral Data

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)

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Link to MinDat.org Location Data.

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

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:

r_electron=2.44 gm/cc
note: r_{Pseudolaueite}=2.43 gm/cc.

Fermion Index

Fermion Index = 0.00484
Boson Index = 0.99516

Photoelectric:

PE_{Pseudolaueite}= 9.56 barns/electron
U=PE_{Pseudolaueite} x r_electron= 23.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pseudolaueite is Not Radioactive

Pseudolaueite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.10)Dana Group

42.11.10.1 Laueite MnFe2(PO4)2(OH)2·8(H2O) P1 1

42.11.10.2 Stewartite MnFe2(PO4)2(OH)2·8(H2O) P1 1

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

42.11.10.4 Ushkovite MgFe2(PO4)2(OH)2·8(H2O) P1 1

42.11.10.5 Ferrolaueite! FeFe2(PO4)2(OH)2·8(H2O) Tri

Strunz Class:

VII/D.09-40 VII - Phosphates, Arsenates and Vanadates

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

VII/D.09 - Vauxite - Pseudolaueite series

VII/D.09-10 Vauxite FeAl2(PO4)2(OH)2·6(H2O) P1 1

VII/D.09-20 Metavauxite FeAl2(PO4)2(OH)2·8(H2O) P 2₁/c 2/m

VII/D.09-25 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2·8(H2O) P1 1

VII/D.09-30 Stewartite MnFe2(PO4)2(OH)2·8(H2O) P1 1

VII/D.09-40 Pseudolaueite MnFe2(PO4)2(OH)2·7-8(H2O) P 2₁/a 2/m

Other Pseudolaueite 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 Pseudolaueite :
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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Pseudolaueite

Mn++Fe+++2(PO4)2(OH)2·7-8(H2O)
Dana No: 42.11.10.3 Strunz No: VII/D.09-40
Locality:

Notes: