Sigloite Mineral Data

Sigloite Mineral Data +

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General Sigloite Information

Chemical Formula:

Fe+++Al2(PO4)2(OH)3·5(H2O)

Composition:

Molecular Weight = 440.85 gm

Aluminum 12.24 % Al 23.13 % Al₂O₃

Iron 12.67 % Fe 18.11 % Fe₂O₃

Phosphorus 14.05 % P 32.20 % P₂O₅

Hydrogen 2.97 % H 26.56 % H₂O

Oxygen 58.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺Al₂(PO₄)₂(OH)₃·5(H₂O)

Environment:

Pseudomorphs of oxidized (Fe3+) paravauxite.

IMA Status:

Approved IMA 1962

Locality:

Sigol XX mine, Llallagua, Potosi, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 68095

PDF 14-171

Sigloite Image

Images:

Sigloite Vauxite

Comments: Lime green, crystalline aggregate of sigloite on massive, blue vauxite.
Location: Llallagua, Potosi Department, Bolivia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Sigloite Crystallography

Axial Ratios:

a:b:c =0.5:1:0.6711

Cell Dimensions:

a = 5.26, b = 10.52, c = 7.06, Z = 1; alpha = 106.933°, beta = 111.5°, gamma = 69.5° V = 325.70 Den(Calc)= 2.25

Crystal System:

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

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

By Intensity(I/I_o): 9.69(1), 4.86(0.9), 6.46(0.9),

Crystal Structure:

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Hawthorne F C , Mineralogy and Petrology , 38 (1988) p.201-211, Sigloite: The oxidation mechanism in [M2(PO4)2(OH)2(H21O)2] structures, Locality: Siglo XX Mine, Llallagau, Bolivia

Physical Properties of Sigloite

Cleavage:

[100] Perfect, [001] Good

Color:

Brown, Light brown, Light yellow, Straw yellow.

Density:

2.35

Diaphaniety:

Transparent

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Sigloite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2619,KPDmeas= 0.2508,KC= 0.2542

Optical Data:

Biaxial (+), a=1.563, b=1.586, g=1.619, bire=0.0560, 2V(Calc)=82, 2V(Meas)=76. Dispersion r < v.

Calculated Properties of Sigloite

Electron Density:

r_electron=2.38 gm/cc
note: r_Sigloite=2.35 gm/cc.

Fermion Index

Fermion Index = 0.00296
Boson Index = 0.99704

Photoelectric:

PE_Sigloite= 4.75 barns/electron
U=PE_Sigloite x r_electron= 11.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sigloite is Not Radioactive

Sigloite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.14)Dana Group

42.11.14.1 Vauxite FeAl2(PO4)2(OH)2·6(H2O) P1 1

42.11.14.2 Paravauxite FeAl2(PO4)2(OH)2·8(H2O) P1 1

42.11.14.3 Sigloite FeAl2(PO4)2(OH)3·5(H2O) P1 1

42.11.14.4 Gordonite MgAl2(PO4)2(OH)2·8(H2O) P1 1

42.11.14.5 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2·8(H2O) P1 1

42.11.14.6 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2·8(H2O) P1 1

Strunz Class:

VII/D.10-40 VII - Phosphates, Arsenates and Vanadates

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

VII/D.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 Sigloite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Sigloite :
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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Sigloite

Fe+++Al2(PO4)2(OH)3·5(H2O)
Dana No: 42.11.14.3 Strunz No: VII/D.10-40
Locality:

Notes: