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Vauxite Mineral Data

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General Vauxite Information

Help on Chemical  Formula: Chemical Formula: Fe++Al2(PO4)2(OH)2•6(H2O)
Help on Composition: Composition: Molecular Weight = 441.86 gm
   Aluminum    12.21 %  Al   23.08 % Al2O3
   Iron        12.64 %  Fe   16.26 % FeO
   Phosphorus  14.02 %  P    32.12 % P2O5
   Hydrogen     3.19 %  H    28.54 % H2O
   Oxygen      57.93 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Al2(PO4)2(OH)2•6(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: Siglo XX tin mines, Llallagua, Potosi, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George Vaux, Jr. (1863-1927), mineral collector, Bryn Mawr, Pennsylvania.
Help on Name Pronunciation: Name Pronunciation: Vauxite Say VAUXITE
Help on Synonym: Synonym: ICSD 24603
  PDF 33-640
 

Vauxite 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

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  Vauxite

Comments: Crystals of vauxite to 1.4mm.
Location: Siglo Mine, Llallagua, Bolivia. Scale: Picture size 3 cm.
© John Veevaert

Vauxite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7881:1:0.5309
Help on Cell Dimensions: Cell Dimensions: a = 9.142, b = 11.599, c = 6.158, Z = 2; alpha = 98.29°, beta = 91.93°, gamma = 108.27° V = 613.24 Den(Calc)= 2.39
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): 10.85(1), 5.457(0.2), 5.908(0.12),
 

Physical Properties of Vauxite

Help on Cleavage: Cleavage: None
Help on Color: Color: Sky blue, Dark blue.
Help on Density: Density: 2.4
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Vauxite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2317,KC= 0.2342
Ncalc = 1.56
Help on Optical Data: Optical Data: Biaxial (+), a=1.551, b=1.555, g=1.562, bire=0.0110, 2V(Calc)=76, 2V(Meas)=32. Dispersion r > v strong.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): blue.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Vauxite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Vauxite =2.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0029623658
Boson Index = 0.9970376342
Help on Photoelectric: Photoelectric: PEVauxite = 4.73 barns/electron
U=PEVauxite x rElectron Density= 11.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vauxite is Not Radioactive
 

Vauxite Classification

Help on  Dana Class: Dana Class: 42.11.14.01 (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.35 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.35 Vauxite FeAl2(PO4)2(OH)2•6(H2O) P1 1
 

Other Vauxite 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 Vauxite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Vauxite Specimen Label here :

Vauxite

Fe++Al2(PO4)2(OH)2•6(H2O)
Dana No: 42.11.14.01 Strunz No: 08.DC.35
Locality:

 

Notes:

 

 
   
 


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