Metavauxite Mineral Data

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.

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Metavauxite

Electron Density:

r_electron=2.39 gm/cc
note: r_Metavauxite=2.34 gm/cc.

Fermion Index

Fermion Index = 0.00277
Boson Index = 0.99723

Photoelectric:

PE_Metavauxite= 4.37 barns/electron
U=PE_Metavauxite x r_electron= 10.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Metavauxite is Not Radioactive

Metavauxite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.11)Dana Group

42.11.11.1 Metavauxite FeAl2(PO4)2(OH)2·8(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.09-20 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 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Metavauxite

Fe++Al2(PO4)2(OH)2·8(H2O)
Dana No: 42.11.11.1 Strunz No: VII/D.09-20
Locality:

Notes: