Metavauxite Mineral Data
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 % Al2 O3
Iron 11.69 % Fe 15.03 % FeO
Phosphorus 12.96 % P 29.70 % P2 O5
Hydrogen 3.80 % H 33.93 % H2 O
Oxygen 60.26 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Fe2+ Al2 (PO4 )2 (OH)2 •8(H2 O)
Environment:
Dimorphous with paravauxite.
IMA Status:
Valid Species (Pre-IMA) 1922
Locality:
Siglo XX mine, Llallagua, Potos�, 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:
Images:
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /c
X Ray Diffraction:
By Intensity(I/Io ): 4.687(1), 4.337(0.8), 10.12(0.7),
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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:
PEMetavauxite = 4.37 barns/electronU=PEMetavauxite x r Electron 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:
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