Laueite Mineral Data

Laueite Mineral Data +

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General Laueite Information

Chemical Formula:

Mn++Fe+++2(PO4)2(OH)2·8(H2O)

Composition:

Molecular Weight = 534.71 gm

Manganese 10.27 % Mn 13.27 % MnO

Iron 20.89 % Fe 29.87 % Fe₂O₃

Phosphorus 11.59 % P 26.55 % P₂O₅

Hydrogen 3.39 % H 30.32 % H₂O

Oxygen 53.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂·8(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1954

Locality:

Hagendorf, Waidhaus, Oberpfalz, Bayern (Bavaria), Germany. Link to MinDat.org Location Data.

Name Origin:

Named for M. F. T. Von Laue.

Synonym:

ICSD 34808

PDF 14-246

Laueite Image

Images:

Laueite

Comments: Purple crystal of laueite on matrix.
Location: Tip Top Mine, Custer County, South Dakota, USA. Scale: Crystal size 0.4 cm.
© John Veevaert

Laueite Crystallography

Axial Ratios:

a:b:c =0.4953:1:0.6697

Cell Dimensions:

a = 5.28, b = 10.66, c = 7.14, Z = 1; alpha = 107.9°, beta = 110.9°, gamma = 71.12° V = 338.04 Den(Calc)= 2.63

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 9.91(1), 3.28(0.9), 4.95(0.8),

Crystal Structure:

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Moore P B , American Mineralogist , 50 (1965) p.1884-1892, The crystal structure of laueite, MnFe2(OH)2(PO4)2(H2O)6.2H2O

Physical Properties of Laueite

Cleavage:

[010] Perfect

Color:

Yellow orange, Honey brown, Light brown.

Density:

2.44 - 2.49, Average = 2.46

Diaphaniety:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Laueite

Gladstone-Dale:

CI meas= 0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.245,KPDmeas= 0.2614,KC= 0.2719

Optical Data:

Biaxial (-), a=1.588-1.603, b=1.654-1.659, g=1.68-1.682, bire=0.0790-0.0920, 2V(Calc)=62, 2V(Meas)=63-66.

Calculated Properties of Laueite

Electron Density:

r_electron=2.48 gm/cc
note: r_Laueite=2.47 gm/cc.

Fermion Index

Fermion Index = 0.00469
Boson Index = 0.99531

Photoelectric:

PE_Laueite= 9.22 barns/electron
U=PE_Laueite x r_electron= 22.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laueite is Not Radioactive

Laueite Classification

Dana Class:

42.11.10.1 (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.10-50 VII - Phosphates, Arsenates and Vanadates

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

VII/D.10 - Paravauxite group

VII/D.10-10 Gordonite MgAl2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-20 Ushkovite MgFe2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-30 Paravauxite FeAl2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-35 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-40 Sigloite FeAl2(PO4)2(OH)3·5(H2O) P1 1

VII/D.10-45 Ferrolaueite! FeFe2(PO4)2(OH)2·8(H2O) Tri

VII/D.10-50 Laueite MnFe2(PO4)2(OH)2·8(H2O) P1 1

Other Laueite Information

References:

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

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Laueite

Mn++Fe+++2(PO4)2(OH)2·8(H2O)
Dana No: 42.11.10.1 Strunz No: VII/D.10-50
Locality:

Notes: