Metavauxite Mineral Data

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General Metavauxite 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:

Dimorphous with paravauxite.

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

Siglo XX mine, Llallagua, Potosí, Bolivia Link to MinDat.org Location Data.

Name Origin:

Named for the chemical relationship to vauxite.

Name Pronunciation:

Metavauxite + Pronunciation

Synonym:

ICSD 24909

PDF 33-639

Metavauxite Image

Images:

Metavauxite

Comments: Clear acicular crystals of metavauxite.
Location: Llallagua, Potosi Department, Bolivia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Metavauxite

Comments: Creamy colored prismatic metavauxite crystals to 3mm.
Location: Siglo XX, Llallagua, Bolivia. Scale: Picture size 3 mm.
© Tom Loomis / Dakota Matrix

Metavauxite Crystallography

Axial Ratios:

a:b:c =1.069:1:0.7262

Cell Dimensions:

a = 10.248, b = 9.586, c = 6.962, Z = 2; beta = 97.87° V = 677.49 Den(Calc)= 2.34

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 4.687(1), 4.337(0.8), 10.12(0.7),

Forms:

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

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Crystal Structure:

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Baur W H , Rao B R , Die Naturwissenschaften , 54 (1967) p.561-561, The crystal structure of metavauxite

Physical Properties of Metavauxite

Cleavage:

None

Color:

Colorless, White, Light green.

Density:

2.345

Diaphaneity:

Transparent to Translucent

Fracture:

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

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Metavauxite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2405,KPDmeas= 0.2399,KC= 0.2421
Ncalc = 1.57

Optical Data:

Biaxial (+), a=1.55, b=1.561, g=1.577, bire=0.0270

Calculated Properties of Metavauxite

Electron Density:

Bulk Density (Electron Density)=2.39 gm/cc
note: Specific Gravity of Metavauxite =2.34 gm/cc.

Fermion Index:

Fermion Index = 0.0027724234
Boson Index = 0.9972275766

Photoelectric:

PE_Metavauxite= 4.37 barns/electron
U=PE_Metavauxite x rElectron Density= 10.44 barns/cc.

Radioactivity:

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

Metavauxite Classification

Dana Class:

42.11.11.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.11)Dana Group

42.11.11.01 Metavauxite FeAl2(PO4)2(OH)2•8(H2O) P 2₁/c 2/m

Strunz Class:

08.DC.25 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.25 Ferrostrunzite FeFe2(PO4)2(OH)2•6(H2O) P 1,P1 Tri

08.DC.25 Ferristrunzite FeFe2(PO4)2(OH)3•5(H2O) P1,P 1 Tri

08.DC.25 Metavauxite FeAl2(PO4)2(OH)2•8(H2O) P 2₁/c 2/m

08.DC.25 Strunzite MnFe2(PO4)2(OH)2•6(H2O) P1 1

Other Metavauxite 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 Metavauxite :
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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Metavauxite

Fe++Al2(PO4)2(OH)2•8(H2O)
Dana No: 42.11.11.01 Strunz No: 08.DC.25
Locality:

Notes: