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Parkinsonite

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Torr Works Quarry (Merehead Quarry), Cranmore, Somerset, England, UK
© Ian Jones

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Formula:
(Pb,Mo,◻)
 
8
O
 
8
Cl
 
2
System:TetragonalColour:Red to purplish-red
Hardness:2 - 2½
Name:For British mineral collector, Reginald F. D. Parkinson.
This page provides mineralogical data about Parkinsonite.

Classification of Parkinsonite

IMA status:Approved 1991
Strunz 8th edition ID:3/D.10-150
Nickel-Strunz 10th (pending) edition ID:3.DB.40

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
Dana 8th edition ID:10.5.11.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
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Type Occurrence of Parkinsonite

Co-type Localities:Wesley Mine, Westbury on Trym, Bristol, England, UK
Torr Works Quarry (Merehead Quarry), Cranmore, Somerset, England, UK
Year of Discovery:1991

Physical Properties of Parkinsonite

Colour:Red to purplish-red
Hardness (Mohs):2 - 2½

Crystallography of Parkinsonite

Crystal System:Tetragonal
Cell Parameters:a = 3.98Å, c = 22.34Å
Ratio:a:c = 1 : 5.613
Unit Cell Volume:V 353.87 ų (Calculated from Unit Cell)

Optical Data of Parkinsonite

Type:Uniaxial (-)
RI values: nω = 2.580 nε = 2.420
Maximum Birefringence:δ = 0.160

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

Chemical Properties of Parkinsonite

Formula:
(Pb,Mo,◻)
 
8
O
 
8
Cl
 
2
Essential elements:Cl, O, Pb
All elements listed in formula:Cl, Mo, O, Pb

Relationship of Parkinsonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DB.Rickturnerite
Pb
 
7
O
 
4
[Mg(OH)
 
4
](OH)Cl
 
3
3.DB.05Diaboleite
Pb
 
2
CuCl
 
2
(OH)
 
4
3.DB.10Pseudoboleite
Pb
 
31
Cu
 
24
Cl
 
62
(OH)
 
48
3.DB.15Boleite
KPb
 
26
Ag
 
9
Cu
 
24
(OH)
 
48
Cl
 
62
3.DB.20Cumengeite
Pb
 
21
Cu
 
20
Cl
 
42
(OH)
 
40
 · 6H
 
2
O
3.DB.25Bideauxite
Pb
 
2
AgCl
 
3
(F,OH)
 
2
3.DB.30Chloroxiphite
Pb
 
3
CuO
 
2
Cl
 
2
(OH)
 
2
3.DB.35Hematophanite
Pb
 
4
Fe
 
3
O
 
8
(OH,Cl)
3.DB.40Asisite
Pb
 
7
(SiO
 
4
)O
 
4
Cl
 
2
3.DB.45Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
 where x<=0.5
3.DB.50Yedlinite
Pb
 
6
Cr
3+
 
Cl
 
6
(O,OH,H
 
2
O)
 
8

Other Names for Parkinsonite

Synonyms:
IMA1991-030
Other Languages:
German:Parkinsonit
Spanish:Parkinsonita

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 Parkinsonite

Reference List:

- +
Symes, R. F., Cressey, G., Criddle, A. J., Stanley, C. J., Francis, J. G. and Jones, G. C. (1994): Parkinsonite, (Pb,Mo,◻)8O8Cl2, a new mineral from Merehead quarry, Somerset. Mineralogical Magazine: 58: 59-68.

New Minerals (1997), New Minerals 1990-1994.

Chemica Scripta: 19: 97-107.

Internet Links for Parkinsonite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Parkinsonite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • Parkinsonite specimens for sale - minfind.com
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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    • Localities for Parkinsonite

    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.
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    (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.
    UK
     
    • England
      • Bristol
        • Westbury on Trym
    		BMS Database; Min.Mag.: 58:59-68 (1994).
      • Somerset
        • Cranmore
    		Min.Mag.: 58:59-68.; Welch, M.D., Schofield, P.F., Cressey, G., and Stanley, G.J. (1996). Cation ordering in lead-molybdenum-vanadium oxychlorides. American Mineralogist, vol. 81, pp 1350-1359; Welch, M.D. and Lepore, G.O. (2010). The crystal structure of parkinsonite, nominally Pb7MoO9Cl2: a naturally occurring Aurivillius phase. Mineralogical Magazine, 74, 269-275. Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46;
    USA
     
    • Arizona
      • Maricopa Co.
        • Painted Rock Mts
          • Painted Rock District
            • Theba
    		PXRD analyzed by Tony Kampf.; Bruce Murphy Collection
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