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Liskeardite

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Big Photo

Penberthy Croft Mine (Wheal Fancy), St Hilary, Mount's Bay District, Cornwall, England, UK
© Steve Rust

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Formula:
(Al,Fe
3+
 
)
 
3
(AsO
 
4
)(OH)
 
6
 · 5H
 
2
O
Colour:White, greenish, bluish, ...
Name:After the locality at Liskeard, Cornwall, England, UK.


A secondary mineral resulting from the oxidation of arsenic-bearing sulfides.

Classification of Liskeardite

IMA status:Questionable/Doubtful
Strunz 8th edition ID:7/D.23-40
Nickel-Strunz 10th (pending) edition ID:8.DF.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
F : With only medium-sized cations, (OH,etc.):RO4 > 3:1
Dana 8th edition ID:42.1.1.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : A3(XO4)Zq·xH2O
Hey's CIM Ref.:20.9.14

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

Type Locality:Marke Valley Mine, Linkinhorne, Caradon & Phoenix Area (South-Eastern Bodmin Moor), Liskeard District, Cornwall, England, UK
Place of Conservation of Type Material:The Natural History Museum, London, England, UK - #50821.
Year of Discovery:1878
Associated Minerals at type locality:
ScoroditeQuartzPyriteChalcopyriteArsenopyrite

Physical Properties of Liskeardite

Diaphaneity (Transparency):Translucent
Colour:White, greenish, bluish, brownish; colourless in transmitted light.

Crystallography of Liskeardite

Morphology:Massive, crusts with a radial-fibrous structure.
X-Ray Powder Diffraction:
d-spacingIntensity
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)
(
(
Comments:Data from Guillemin (1952) for specimen from Cap Garonne.
Type material gives a poor X-ray pattern.

Optical Data of Liskeardite

Type:Biaxial (+)
RI values: nα = 1.661 nβ = 1.675 nγ = 1.689
2V:Measured: 90° , Calculated: 88°
Maximum Birefringence:δ = 0.028

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r < v strong

Chemical Properties of Liskeardite

Formula:
(Al,Fe
3+
 
)
 
3
(AsO
 
4
)(OH)
 
6
 · 5H
 
2
O
Essential elements:Al, As, H, O
All elements listed in formula:Al, As, Fe, H, O

Relationship of Liskeardite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DF.05Hotsonite
Al
 
11
(SO
 
4
)
 
3
(PO
 
4
)
 
2
(OH)
 
21
 · 16H
 
2
O
8.DF.10Bolivarite
Al
 
2
(PO
 
4
)(OH)
 
3
 · 4-5H
 
2
O
8.DF.10Evansite
Al
 
3
(PO
 
4
)(OH)
 
6
 · 6H
 
2
O
8.DF.10Rosièresite
(Pb, Cu, Al, P, O, H)
8.DF.15Rusakovite
(Fe
3+
 
,Al)
 
5
(VO
 
4
,PO
 
4
)
 
2
(OH)
 
9
 · 3H
 
2
O
8.DF.20Liroconite
Cu
 
2
Al(AsO
 
4
)(OH)
 
4
 · 4H
 
2
O
8.DF.25Sieleckiite
Cu
 
3
Al
 
4
(PO
 
4
)
 
2
(OH)
 
12
 · 2H
 
2
O
8.DF.30Chalcophyllite
Cu
 
18
Al
 
2
(SO
 
4
)
 
3
(AsO
 
4
)
 
3
(OH)
 
27
 · 33H
 
2
O
8.DF.35Parnauite
Cu
 
9
(AsO
 
4
)
 
2
(SO
 
4
)(OH)
 
10
 · 7H
 
2
O
8.DF.40Gladiusite
Fe
 
2
(Fe,Mg)
 
4
(PO
 
4
)(OH)
 
11
(H
 
2
O)
Related Minerals - Hey's Index Grouping:

- +
20.9.1Angelellite
Fe
3+
4
(AsO
 
4
)
 
2
O
 
3
20.9.2Scorodite
FeAsO
 
4
 · 2H
 
2
O
20.9.3Kaňkite
FeAsO
 
4
 · 3.5H
 
2
O
20.9.4Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
20.9.5Kaatialaite
Fe(H
 
2
AsO
 
4
)
 
3
 · 5H
 
2
O
20.9.6Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.9.7Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.9.8Natropharmacosiderite
(Na,K)Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
20.9.9Pharmacosiderite
KFe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
20.9.10Kolfanite
Ca
 
2
Fe
3+
2
(AsO
 
4
)
 
3
O
 
2
 · 2H
 
2
O
20.9.11Arseniosiderite
Ca
 
2
Fe
3+
3
(AsO
 
4
)
 
3
O
 
2
 · 3H
 
2
O
20.9.12Yukonite
Ca
 
3
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
20.9.13Dussertite
BaFe
3+
3
(AsO
 
4
)
 
2
(OH)
 
5
20.9.15Mapimite
Zn
 
2
Fe
3+
3
(AsO
 
4
)
 
3
(OH)
 
4
 · 10H
 
2
O
20.9.16Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)(AsO
 
4
)
 
4
(OH)
 
6
 · 6H
 
2
O
20.9.17Walentaite
H(Ca,Mn
2+
 
,Fe
2+
 
)Fe
3+
3
(AsO
 
4
,PO
 
4
)
 
4
 · 7H
 
2
O

Other Names for Liskeardite

Other Languages:
German:Liskeardit
Spanish:Liskeardita

Other Information

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

References for Liskeardite

Reference List:

- +
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.

Internet Links for Liskeardite

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    • Localities for Liskeardite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Provence-Alpes-Côte d'Azur
      • Var
        • Le Pradet
    		Guillemin, G. (1952): Bulletin de la Société française de Minéralogie et de Cristallographie 75: 71.
    Germany
     
    • Saxony
      • Vogtland
        • Klingenthal
          • Mühlleithen
    		http://rruff.geo.arizona.edu/doclib/hom/liskeardite.pdf
    UK
     
    • England
      • Cornwall
        • Camborne - Redruth - St Day District
          • Gwennap
            • St Day United Mines (Poldice Mines)
    		No reference listed
        • Liskeard District
          • Caradon & Phoenix Area (South-Eastern Bodmin Moor)
            • Linkinhorne
    		Bulletin de la Société française de Minéralogie et de Cristallographie (1952): 75: 71.
        • Mount's Bay District
          • St Hilary
    		No reference listed
        • St Erth - Gwithian Area
          • Gwinear
            • Fraddam
    		No reference listed
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