Paravauxite Mineral Data

Paravauxite Mineral Data +

General Paravauxite Information

Chemical Formula:

Fe++Al2(PO4)2(OH)2·8(H2O)

Composition:

Molecular Weight = 477.89 gm

Aluminum 11.29 % Al 21.34 % Al₂O₃

Iron 11.69 % Fe 15.03 % FeO

Phosphorus 12.96 % P 29.70 % P₂O₅

Hydrogen 3.80 % H 33.93 % H₂O

Oxygen 60.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Al₂(PO₄)₂(OH)₂·8(H₂O)

Environment:

Associated with vauxite, metavauxite and wavellite.

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

Llallagua, Potosi, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for the chemical similarity to vauxite. Polymorph of metavauxite.

Synonym:

ICSD 24456

PDF 29-1424

Paravauxite Image

Images:

Paravauxite

Comments: Radiating group of pastel blue/green paravauxite crystals to 1cm.
Location: Siglo XX Mine, Llallagua, Bolivia. Scale: 1.8 x 1.5 x 1 cm.
© Isaias Casanova / IC Minerals

Images:

Paravauxite

Comments: Light-green, elongated paravauxite crystals.
Location: Siglo XX mine, Llallagua, Bolivia. Scale: Crystal size 1 cm.
© Minernet

Paravauxite Crystallography

Axial Ratios:

a:b:c =0.4961:1:0.6602

Cell Dimensions:

a = 5.239, b = 10.56, c = 6.972, Z = 1; alpha = 106.8°, beta = 110.78°, gamma = 72.13° V = 328.58 Den(Calc)= 2.41

Crystal System:

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

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

By Intensity(I/I_o): 9.89(1), 6.4(0.65), 4.93(0.3),

Forms:

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Crystal Structure:

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Baur W H , Neues Jahrbuch fur Mineralogie, Monatshefte , 1969 (1969) p.430-433, The crystal structure of paravauxite, Fe2+Al2(PO4)2(OH)2(OH2)6*2H2O

Physical Properties of Paravauxite

Cleavage:

[010] Perfect

Color:

Colorless, Greenish white, Light greenish white.

Density:

2.36

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Paravauxite

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2328,KPDmeas= 0.2377,KC= 0.2421

Optical Data:

Biaxial (+), a=1.552, b=1.559, g=1.572, bire=0.0200, 2V(Calc)=74, 2V(Meas)=72.

Calculated Properties of Paravauxite

Electron Density:

r_electron=2.41 gm/cc
note: r_Paravauxite=2.36 gm/cc.

Fermion Index

Fermion Index = 0.00277
Boson Index = 0.99723

Photoelectric:

PE_Paravauxite= 4.37 barns/electron
U=PE_Paravauxite x r_electron= 10.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paravauxite is Not Radioactive

Paravauxite Classification

Dana Class:

42.11.14.2 (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.10-30 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 Paravauxite Information

References:

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

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Paravauxite

Fe++Al2(PO4)2(OH)2·8(H2O)
Dana No: 42.11.14.2 Strunz No: VII/D.10-30
Locality:

Notes: