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Ferrivauxite

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Formula:
Fe3+Al2(PO4)2(OH)3·5H2O
Colour:
Golden brown
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.39 (Calculated)
Crystal System:
Triclinic
Name:
After vauxite and the ferric content of the mineral.
An oxidized equivalent of vauxite. Also the lower hydrate equivalent of sigloite (the heptahydrate). Forms oxidation pseudomorphs after vauxite. Chemically similar to yet another Fe3+-Al phosphate, cacoxenite.


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Classification of FerrivauxiteHide

Approved
Approval Year:
2014

Physical Properties of FerrivauxiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Golden brown
Streak:
Pale yellow-brown
Hardness:
3½ on Mohs scale
Comment:
Estimated to be ∼3½ by comparison with vauxite
Tenacity:
Brittle
Cleavage:
None Observed
Shows no cleavage.
Fracture:
Irregular/Uneven
Density:
2.39 g/cm3 (Calculated)

Optical Data of FerrivauxiteHide

Type:
Biaxial (-)
RI values:
nα = 1.589(1) nβ =
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(1) nγ = 1.596(1)
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Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of FerrivauxiteHide

Formula:
Fe3+Al2(PO4)2(OH)3·5H2O
IMA Formula:
Fe3+Al2(PO4)2(OH)3 · 5H2O

Crystallography of FerrivauxiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 9.198(2) Å, b = 11.607(3) Å, c = 6.112(2) Å
α = 98.237(9)°, β = 91.90(1)°, γ = 108.658(9)°
Ratio:
a:b:c = 0.792 : 1 : 0.527
Unit Cell V:
609.68 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Occurs on {010}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.834(100)
8.682(24)
8.242(65)
6.018(28)
5.918(23)
5.491(29)
4.338(26)
2.898(32)
Comments:
From Type Description.

Type Occurrence of FerrivauxiteHide

General Appearance of Type Material:
As oxidation pseudomorphs after vauxite
Place of Conservation of Type Material:
Collections of the Natural History Museum, University of Oslo, Norway, catalogue number 43576 and the Canadian Museum of Nature, Ottawa, Ontario, Canada
Associated Minerals at Type Locality:

Synonyms of FerrivauxiteHide

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.

References for FerrivauxiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Raade, G., Grice, J. and Rowe, R. (2014) Ferrivauxite, IMA 2014-003. CNMNC Newsletter No. 20, June 2014, page 555; Mineralogical Magazine, 78, 549-558.
Raade, G., Grice, J.D., Rowe, R. (2016): Ferrivauxite, a new phosphate mineral from Llallagua, Bolivia. Mineralogical Magazine, 80, 311-324

Internet Links for FerrivauxiteHide

Localities for FerrivauxiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Bolivia (TL)
 
  • Potosí Department
    • Rafael Bustillo Province (Bustillos Province)
      • Llallagua
Raade, G., Grice, J. and Rowe, R. (2014) Ferrivauxite, IMA 2014-003. CNMNC Newsletter No. 20, June 2014, page 555; Mineralogical Magazine, 78, 549-558.; Raade, G., Grice, J.D., Rowe, R. (2016): Ferrivauxite, a new phosphate mineral from Llallagua, Bolivia. Mineralogical Magazine, 80, 311-324
Mineral and/or Locality  
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