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.

Name Pronunciation:

Paravauxite + Pronunciation

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.
© Sandro Maggia/Minernet.it

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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Forms: ( 0 1 1) ( 0 1 0) ( 1 1 0) ( 1 2 0) ( 1 0 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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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

Diaphaneity:

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= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2377,KPDmeas= 0.2377,KC= 0.2421
Ncalc = 1.57

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:

Bulk Density (Electron Density)=2.41 gm/cc
note: Specific Gravity of Paravauxite =2.36 gm/cc.

Fermion Index:

Fermion Index = 0.0027724234
Boson Index = 0.9972275766

Photoelectric:

PE_Paravauxite= 4.37 barns/electron
U=PE_Paravauxite x rElectron Density= 10.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Paravauxite is Not Radioactive

Paravauxite Classification

Dana Class:

42.11.14.02 (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

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 Paravauxite Information

References:

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

See Also:

Links to other databases for Paravauxite :
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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Ask about Paravauxite here :
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Print or Cut-and-Paste your Paravauxite Specimen Label here :

Paravauxite

Fe++Al2(PO4)2(OH)2•8(H2O)
Dana No: 42.11.14.02 Strunz No: 08.DC.30
Locality:

Notes: