Vauxite Mineral Data

Vauxite Mineral Data +

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General Vauxite Information

Chemical Formula:

Fe++Al2(PO4)2(OH)2·6(H2O)

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

Empirical Formula:

Fe²⁺Al₂(PO₄)₂(OH)₂·6(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

Siglo XX tin mines, Llallagua, Potosi, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for George Vaux, Jr. (1863-1927), mineral collector, Bryn Mawr, Pennsylvania.

Synonym:

ICSD 24603

PDF 33-640

Vauxite Image

Images:

Vauxite Sigloite

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

Images:

Vauxite

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

Vauxite Crystallography

Axial Ratios:

a:b:c =0.7881:1:0.5309

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

Crystal System:

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

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

By Intensity(I/I_o): 10.85(1), 5.457(0.2), 5.908(0.12),

Crystal Structure:

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Baur W H , Rama Rao B , American Mineralogist , 53 (1968) p.1025-1033, The crystal structure and the chemical composition of vauxite

Physical Properties of Vauxite

Cleavage:

None

Color:

Sky blue, Dark blue.

Density:

2.4

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5 - Copper Penny

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vauxite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2326,KPDmeas= 0.2317,KC= 0.2342

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.

Pleochroism (x):

colorless.

Pleochroism (y):

blue.

Pleochroism (z):

colorless.

Calculated Properties of Vauxite

Electron Density:

r_electron=2.42 gm/cc
note: r_Vauxite=2.39 gm/cc.

Fermion Index

Fermion Index = 0.00296
Boson Index = 0.99704

Photoelectric:

PE_Vauxite= 4.73 barns/electron
U=PE_Vauxite x r_electron= 11.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vauxite is Not Radioactive

Vauxite Classification

Dana Class:

42.11.14.1 (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.09-10 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 Vauxite Information

References:

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

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Vauxite

Fe++Al2(PO4)2(OH)2·6(H2O)
Dana No: 42.11.14.1 Strunz No: VII/D.09-10
Locality:

Notes: