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Sigloite Mineral Data

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General Sigloite Information

Help on Chemical  Formula: Chemical Formula: Fe+++Al2(PO4)2(OH)3•5(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+Al2(PO4)2(OH)3•5(H2O)
Help on Environment: Environment: Pseudomorphs of oxidized (Fe3+) paravauxite.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Sigol XX mine, Llallagua, Potosi, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Sigloite Say SIGLOITE
Help on Synonym: Synonym: ICSD 68095
  PDF 14-171
 

Sigloite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.5:1:0.6711
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.69(1), 4.86(0.9), 6.46(0.9),
 

Physical Properties of Sigloite

Help on Cleavage: Cleavage: {100} Perfect, {001} Good
Help on Color: Color: Brown, Light brown, Light yellow, Straw yellow.
Help on Density: Density: 2.35
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Sigloite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2691,KPDmeas= 0.2508,KC= 0.2542
Ncalc = 1.56 - 1.6
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.38 gm/cc
note: Specific Gravity of Sigloite =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0029687958
Boson Index = 0.9970312042
Help on Photoelectric: Photoelectric: PESigloite = 4.75 barns/electron
U=PESigloite x rElectron Density= 11.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sigloite is Not Radioactive
 

Sigloite Classification

Help on  Dana Class: Dana Class: 42.11.14.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.14)Vauxite Group
 
42.11.14.01 Vauxite FeAl2(PO4)2(OH)2•6(H2O) P1 1
 
42.11.14.02 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.14.03 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1
 
42.11.14.04 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.14.05 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.14.06 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.14.07 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1
Help on  Strunz Class: 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 Sigloite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Sigloite :
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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Sigloite

Fe+++Al2(PO4)2(OH)3•5(H2O)
Dana No: 42.11.14.03 Strunz No: 08.DC.30
Locality:

 

Notes:

 

 
   
 


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