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About LiskearditeHide

[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2O
Formerly thought to be (Al,Fe3+)3(AsO4)(OH)6.5H2O.
White, greenish, bluish, brownish; colourless in transmitted light.
Crystal System:
After the locality at Liskeard, Cornwall, England, UK.
A secondary mineral resulting from the oxidation of arsenic-bearing sulfides.

Chemically similar to bettertonite.

Classification of LiskearditeHide

Approved, 'Grandfathered' (first described prior to 1959)

D : Phosphates, etc. with additional anions, with H2O
F : With only medium-sized cations, (OH,etc.):RO4 > 3:1

1 : A3(XO4)Zq·xH2O

20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe

Pronounciation of LiskearditeHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of LiskearditeHide

White, greenish, bluish, brownish; colourless in transmitted light.

Optical Data of LiskearditeHide

Biaxial (+)
RI values:
nα = 1.661 nβ = 1.675 nγ = 1.689
Measured: 90° , Calculated: 88°
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v strong

Chemical Properties of LiskearditeHide

[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2O

Formerly thought to be (Al,Fe3+)3(AsO4)(OH)6.5H2O.
IMA Formula:
(Al,Fe)32(AsO4)18(OH)42(H2O)22 · 52H2O

Crystallography of LiskearditeHide

Crystal System:
Massive, crusts with a radial-fibrous structure.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
17.6 (100)
12.2 (60)
8.65 (80)
7.85 (65)
7.44 (60)
5.66 (20)
4.76 (20)
4.56 (20)
4.25 (40)
3.95 (40)
3.44 (20)
3.33 (100)
3.22 (40)
3.12 (20)
2.85 (40)
2.78 (40)
2.59 (40)
2.47 (20)
2.37 (60)
2.28 (40)
2.24 (40)
Data from Guillemin (1952) for specimen from Cap Garonne.
Type material gives a poor X-ray pattern.

Type Occurrence of LiskearditeHide

Place of Conservation of Type Material:
The Natural History Museum, London, England, UK - #50821.
Associated Minerals at Type Locality:

Other Language Names for LiskearditeHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Chalcophyllite1 photo of Liskeardite associated with Chalcophyllite on mindat.org.
Mimetite1 photo of Liskeardite associated with Mimetite on mindat.org.
Carminite1 photo of Liskeardite associated with Carminite on mindat.org.
Cyanotrichite1 photo of Liskeardite associated with Cyanotrichite on mindat.org.
Scorodite1 photo of Liskeardite associated with Scorodite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DF.05HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2OTric.
8.DF.10BolivariteAl2(PO4)(OH)3 · 4-5H2OAmor.
8.DF.10EvansiteAl3(PO4)(OH)6 · 6H2OAmor.
8.DF.10Rosièresite(Pb, Cu, Al, P, O, H)Amor.
8.DF.15Rusakovite(Fe3+,Al)5(VO4,PO4)2(OH)9 · 3H2O
8.DF.20LiroconiteCu2Al(AsO4)(OH)4 · 4H2OMon. 2/m
8.DF.25SieleckiiteCu3Al4(PO4)2(OH)12 · 2H2OMon. 2/m : B2/m
8.DF.30ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2OTrig. 3 : R3
8.DF.35ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2OOrth. mm2 : Pmn21

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.9.1AngelelliteFe3+4(AsO4)2O3Tric. 1 : P1
20.9.2ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
20.9.3KaňkiteFeAsO4 · 3.5H2OMon.
20.9.4FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
20.9.5KaatialaiteFe(H2AsO4)3 · 5H2OMon. 2/m
20.9.6SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
20.9.7ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.9.8Natropharmacosiderite(Na,K)Fe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.9PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.10KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
20.9.11ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
20.9.12YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
20.9.13DussertiteBaFe3+3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.9.15MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
20.9.16OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
20.9.17WalentaiteH(Ca,Mn2+,Fe2+)Fe3+3(AsO4,PO4)4 · 7H2OOrth.

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 LiskearditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Talling, R. (1874)
Maskelyne (1878) Nature: 18: 426.
Flight, W. (1883): Two new aluminous mineral species, Evigtokite and Liskeardite. Journal of the Chemical Society, Transactions, 43, 140.
Lacroix (1901) Bulletin de la Société française de Minéralogie: 24: 27.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 101.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 924.
Guillemin, G. (1952): Bulletin de la Société française de Minéralogie et de Cristallographie 75: 71.
Grey, I.E., Mumme, W.G., MacRae, C.M., Caradoc-Davies, T., Price, J.R., Rumsey, M.S., Mills, S.J. (2013): Chiral edge-shared octahedral chains in liskeardite, [(Al,Fe)32(AsO4)18(OH)42(H2O)22]•52H2O, an open framework mineral with a pharmacoalumite-related structure. Mineralogical Magazine, 77, 3125-3135.
Grey, I.E., Brand, H.E.A., Rumsey, M.S., Gozukara, Y. (2015): Ultra-flexible framework breathing in response to dehydration in liskeardite, [(Al,Fe)16(AsO4)9(OH)21(H2O)11]·26H2O, a natural open-framework compound. J. Solid State Chem., 228, 146-152.

Internet Links for LiskearditeHide

Localities for LiskearditeHide

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.
  • Provence-Alpes-Côte d'Azur
    • Var
      • Le Pradet
Guillemin, G. (1952): Bulletin de la Société française de Minéralogie et de Cristallographie 75: 71.
  • Saxony
    • Vogtland
      • Klingenthal
        • Mühlleithen
  • England
    • Cornwall
      • Gwennap
        • St Day
No reference listed
      • Gwinear-Gwithian
        • Fraddam
No reference listed
      • Linkinhorne
        • Upton Cross
Bulletin de la Société française de Minéralogie et de Cristallographie (1952): 75: 71.
      • St Hilary
Golley, P., Williams, R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications, Truro, Cornwall. Grey, I.E., Kampf, A.R., Price, J.R., Macrae, C.M. (2015) Bettertonite, [Al₆(AsO₄)₃(OH)₉ (H₂O)₅ ]·11H₂O, a new mineral from the Penberthy Croft mine, St. Hilary, Cornwall, UK, with a structure based on polyoxometalate clusters. Mineralogical Magazine, 79:7, 1849-1858.
Mineral and/or Locality  
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