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Metavauxite

A valid IMA mineral species - grandfathered
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01503210014947306281991.jpg
Metavauxite, etc.

Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
08309500014950226791612.jpg
Metavauxite, etc.

Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
03782760017087028188615.jpg
Metavauxite

Llallagua, Rafael Bustillo Province, Potosí, Bolivia
01503210014947306281991.jpg
Metavauxite, etc.

Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
09654100014947623508192.jpg
Metavauxite, etc.

Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
03782760017087028188615.jpg
Metavauxite

Llallagua, Rafael Bustillo Province, Potosí, Bolivia
01503210014947306281991.jpg
Metavauxite, etc.

Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
09654100014947623508192.jpg
Metavauxite, etc.

Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
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About MetavauxiteHide

Formula:
Fe2+Al2(PO4)2(OH)2 · 8H2O
Colour:
Colourless, white, light green; colourless in transmitted light.
Lustre:
Sub-Vitreous, Silky
Hardness:
3
Specific Gravity:
2.345
Crystal System:
Monoclinic
Name:
Named in 1927 by Samuel George Gordon allusion to the chemical relationship to Vauxite.
Dimorph of:
Paravauxite
The monoclinic dimorph of Paravauxite.

A rare supergene secondary mineral in the oxidized zone of tin mines.


Unique IdentifiersHide

Mindat ID:
2621
Long-form identifier:
mindat:1:1:2621:1
GUID
(UUID V4):
255f5b55-352f-449d-9909-dc33d19c7895

IMA Classification of MetavauxiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)

Classification of MetavauxiteHide

Strunz-mindat (2024):
8.DC.25

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
Dana 8th ed.:
42.11.11.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
Hey's CIM Ref.:
19.14.24

19 : Phosphates
14 : Phosphates of Fe and other metals

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MvxIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MetavauxiteHide

Lustre:
Sub-Vitreous, Silky
Transparency:
Transparent, Translucent
Comment:
Lustre silky in aggregates.
Colour:
Colourless, white, light green; colourless in transmitted light.
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.345 g/cm3 (Measured)    2.36 g/cm3 (Calculated)

Optical Data of MetavauxiteHide

Type:
Biaxial (+)
RI values:
nα = 1.550 nβ = 1.561 nγ = 1.577
2V:
Measured: 75° to 90°
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v strong
Optical Extinction:
0.027
Pleochroism:
Non-pleochroic

Chemistry of MetavauxiteHide

Mindat Formula:
Fe2+Al2(PO4)2(OH)2 · 8H2O
Elements listed:
Al, Fe, H, O, P - search for minerals with similar chemistry

Crystallography of MetavauxiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P1 21/c 1
Cell Parameters:
a = 10.22 Å, b = 9.56 Å, c = 6.94 Å
β = 97.87°
Ratio:
a:b:c = 1.069 : 1 : 0.726
Unit Cell V:
671.67 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals prismatic to acicular, elongated [001], exhibiting forms {100}, {110}, {101}, {111}, and {211}. Commonly in subparallel to radial aggregates.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012432MetavauxiteBaur W H, Rao B R (1967) The crystal structure of metavauxite Die Naturwissenschaften 54 561-56119670293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.12 Å(69)
5.095 Å(50)
4.687 Å(100)
4.337 Å(79)
3.985 Å(54)
2.764 Å(75)
2.749 Å(32)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47c : [Carbonates, phosphates, borates, nitrates]

Type Occurrence of MetavauxiteHide

Type Locality:
ⓘ Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
Place of Conservation of Type Material:
The Natural History Museum, London, England: #1928,335. The U.S. National Museum of Natural History, Washington, D.C., USA: #136009.
Geological Setting of Type Material:
Oxidized zone of tin veins.
Associated Minerals at Type Locality:
WavelliteVauxiteQuartzParavauxite

Other Language Names for MetavauxiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
196 photos of Metavauxite associated with ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
193 photos of Metavauxite associated with VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
95 photos of Metavauxite associated with SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
30 photos of Metavauxite associated with WavelliteAl3(PO4)2(OH,F)3 · 5H2O
21 photos of Metavauxite associated with QuartzSiO2
18 photos of Metavauxite associated with FranckeiteFe2+(Pb,Sn2+)6Sn4+2Sb2S14
14 photos of Metavauxite associated with PyriteFeS2
8 photos of Metavauxite associated with GreenockiteCdS
5 photos of Metavauxite associated with RömeriteFe2+Fe3+2(SO4)4 · 14H2O
3 photos of Metavauxite associated with SideriteFeCO3

Related Minerals - Strunz-mindat GroupingHide

8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 2 2 2 : P21 21 21
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15Cobaltarthurite(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UM2006-27-PO:FeHZnZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.30Kayrobertsonite[MnAl2(PO4)2(OH)2(H2O)4] · 2H2OTric. 1 : P1
8.DC.30KummeriteMn2+Fe3+Al(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric. 1
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/b

Fluorescence of MetavauxiteHide

In UV light:
Not fluorescent in UV

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for MetavauxiteHide

References for MetavauxiteHide

Localities for MetavauxiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Bolivia
 
  • Potosí
    • Nor Chichas Province
      • Cerro Tazna
        • Tasna Rosario
Palache et al. (1951) +1 other reference
    • Rafael Bustillo Province
      • Llallagua
American Mineralogist (1927) +2 other references
Canada
 
  • Yukon
    • Dawson mining district
Pavel M. Kartashov analytical data 2018
Sweden
 
  • Norrbotten County
    • Kiruna
      • Svappavaara
Anonymous (1991)
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