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Barstowite

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Formula:
Pb
 
4
Cl
 
6
(CO
 
3
) · H
 
2
O
System:MonoclinicColour:Transparent to white
Lustre:AdamantineHardness:3
Name:Named after Richard W. Barstow (1947-1982), Cornish mineral collector and dealer


Visually indistinguishable from Unnamed (Orthorhombic dimorph of Barstowite).

Classification of Barstowite

IMA status:Approved 1989
Strunz 8th edition ID:5/E.08-100
Nickel-Strunz 10th (pending) edition ID:3.DC.95

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Dana 8th edition ID:12.1.7.1

12 : COMPOUND HALIDES
1 : Miscellaneous
Hey's CIM Ref.:12.1.24

12 : Carbonates with other anions
1 : Carbonates with halides
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Type Occurrence of Barstowite

Type Locality:Bounds Cliff, St Endellion, Wadebridge District, Cornwall, England, UK

Physical Properties of Barstowite

Lustre:Adamantine
Colour:Transparent to white
Streak:White
Hardness (Mohs):3

Crystallography of Barstowite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m
Cell Parameters:a = 4.2043(8) Å, b = 9.199(2) Å, c = 16.663(3) Å
β = 91.82(1)°
Ratio:a:b:c = 0.457 : 1 : 1.811
Unit Cell Volume:V 644.12 ų (Calculated from Unit Cell)
Z:2
Comment:Two published structure refinements are in good agreement.
X-Ray Powder Diffraction:
d-spacingIntensity
4.16 (5)
4.02 (10)
3.79 (3)
3.045 (3)
2.377 (6)
2.296 (8)
2.108 (4)
Comments:Data for type material.

Chemical Properties of Barstowite

Formula:
Pb
 
4
Cl
 
6
(CO
 
3
) · H
 
2
O
Simplified for copy/paste:Pb4Cl6(CO3)·H2O
Essential elements:C, Cl, H, O, Pb
All elements listed in formula:C, Cl, H, O, Pb

Relationship of Barstowite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DC.05Laurionite
PbCl(OH)
3.DC.05Paralaurionite
PbCl(OH)
3.DC.10Fiedlerite
Pb
 
3
FCl
 
4
(OH) · H
 
2
O
3.DC.15Penfieldite
Pb
 
2
Cl
 
3
(OH)
3.DC.20Laurelite
Pb
 
7
F
 
12
Cl
 
2
3.DC.25Bismoclite
(BiO)Cl
3.DC.25Daubréeite
(BiO)(OH,Cl)
3.DC.25Matlockite
PbFCl
3.DC.25Rorisite
CaFCl
3.DC.25Zavaritskite
(BiO)F
3.DC.25Zhangpeishanite
BaFCl
3.DC.30Nadorite
PbSbClO
 
2
3.DC.30Perite
PbBiClO
 
2
3.DC.35Aravaipaite
Pb
 
3
F
 
3
[AlF
 
6
] · H
 
2
O
3.DC.37Calcioaravaipaite
PbCa
 
2
AlF
 
9
3.DC.40Thorikosite
Pb
 
3
Cl
 
2
(OH)(SbO
 
3
,AsO
 
3
)
3.DC.45Mereheadite
Pb
 
47
Cl
 
25
(OH)
 
13
O
 
24
(CO
 
3
)(BO
 
3
)
 
2
3.DC.50Blixite
Pb
 
2
(O,OH)
 
2
Cl
3.DC.55Pinalite
Pb
 
3
WO
 
5
Cl
 
2
3.DC.60Symesite
Pb
 
10
(SO
 
4
)O
 
7
Cl
 
4
· H
 
2
O
3.DC.65Ecdemite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
3.DC.65Heliophyllite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
3.DC.70Mendipite
Pb
 
3
Cl
 
2
O
 
2
3.DC.75Damaraite
Pb
 
3
Cl(OH)O
 
2
3.DC.80Onoratoite
Sb
 
8
Cl
 
2
O
 
11
3.DC.85Cotunnite
PbCl
 
2
3.DC.90Pseudocotunnite
K
 
2
PbCl
 
4
Related Minerals - Hey's Index Grouping:

- +
12.1.1Northupite
Na
 
3
Mg(CO
 
3
)
 
2
Cl
12.1.2Barentsite
Na
 
7
Al(HCO
 
3
)
 
2
(CO
 
3
)
 
2
F
 
4
12.1.3Rouvilleite
Na
 
3
(Ca,Mn,Fe)
 
2
(CO
 
3
)
 
3
F
12.1.4Chlormagaluminite
Mg
 
4
Al
 
2
(OH)
 
12
Cl
 
2
· 3H
 
2
O
12.1.5Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
(x<0.5)
12.1.6Brenkite
Ca
 
2
(CO
 
3
)F
 
2
12.1.7Stenonite
(Sr,Ba,Na)
 
2
Al(CO
 
3
)F
 
5
12.1.8Bastnäsite-(Ce)
(Ce,La)(CO
 
3
)F
12.1.9Bastnäsite-(La)
(La,Ce)(CO
 
3
)F
12.1.10Bastnäsite-(Y)
(Y,Ce)(CO
 
3
)F
12.1.11Parisite-(Ce)
Ca(Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
12.1.12Parisite-(Nd)
Ca(Nd,Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
12.1.13Synchysite-(Ce)
Ca(Ce,La)(CO
 
3
)
 
2
F
12.1.14Synchysite-(Y)
Ca(Y,Ce)(CO
 
3
)
 
2
F
12.1.15Synchysite-(Nd)
Ca(Nd,Y,Gd)(CO
 
3
)
 
2
F
12.1.16Röntgenite-(Ce)
Ca
 
2
(Ce,La)
 
3
(CO
 
3
)
 
5
F
 
3
12.1.17Cordylite-(Ce)
NaBaCe
 
2
(CO
 
3
)
 
4
F
12.1.19Huanghoite-(Ce)
BaCe(CO
 
3
)
 
2
F
12.1.20Zhonghuacerite-(Ce)
Ba
 
2
Ce(CO
 
3
)
 
3
F
12.1.21Cebaite-(Ce)
Ba
 
3
Ce
 
2
(CO
 
3
)
 
5
F
 
2
12.1.22Thorbastnäsite
Th(Ca,Ce)(CO
 
3
)
 
2
F
 
2
· 3H
 
2
O
12.1.23Phosgenite
Pb
 
2
CO
 
3
Cl
 
2
12.1.25Albrechtschraufite
Ca
 
4
Mg(UO
 
2
)
 
2
(CO
 
3
)
 
6
F
 
2
· 17-18H
 
2
O
12.1.26Kettnerite
CaBiCO
 
3
OF

Other Names for Barstowite

Synonyms:
IMA1989-057
Other Languages:
German:Barstowit
Russian:Барстоуит
Spanish:Barstowita

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 Barstowite

Reference List:

- +
Stanley, C.J., G.C. Jones, A.D. Hart, P. Keller, and D. Lloyd (1991): Barstowite, 3PbCl2 • PbCO3 • H2 O, a new mineral from Bounds Cliff, St Endellion, Cornwall. Mineral. Mag., 55, 121–125.

Am. Mineral., 77 (1992) 670 (abs.)

Kutzke, H., Barbier, B., Becker, P. & Eggert, G. (1997): Barstowite as a corrosion product on a lead object from the Mahdia shipwreck. Studies in Conservation 42, 176-180.

Kutzke, H., H. Klapper, S. Merlino, M. Pasero, N. Perchiazzi, and G. Eggert (2000): The crystal structure of barstowite, Pb4Cl6(CO3)•H2O, determined on crystals from Etruscan slag and from a Late-Hellenistic shipwreck. Zeits. Krist., 215, 110–113.

Internet Links for Barstowite

Search Engines:
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  • External Links:
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  • Look for Barstowite on Wikipedia
  • Look for Barstowite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Barstowite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Fabre Minerals - search for Barstowite specimens
  • Localities for Barstowite

    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.
    (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.
    Austria
     
    • Tyrol
      • North Tyrol
        • Inn valley
          • Brixlegg - Schwaz area
            • Brixlegg - Rattenberg
              • St Gertraudi
    Lapis 19 (7/8):69 (1994)
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District slag localities
          • Passa Limani area
    Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals of the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Vrissaki area
    Uwe Kolitsch (SXRD analysis)
    Italy
     
    • Tuscany
      • Livorno Province
        • Campiglia Marittima
    http://www.comune.pisa.it/apsn/Articoli/Scorie/Capattoli.htm
    Kutzke, H., H. Klapper, S. Merlino, M. Pasero, N. Perchiazzi, and G. Eggert (2000) The crystal structure of barstowite, Pb4Cl6(CO3)•H2O, determined on crystals from Etruscan slags and from a Late-Hellenistic shipwreck. Zeits. Kristallogr., 215, 110-113.
        • Piombino
    Cerutti, G. and Preite, D. (1995): Mineralien der etruskischen Schlacken von Baratti, Toskana. Lapis, 20 (4), 13-18; 50 (in German).
    Kazakhstan
     
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
      • Kayrakty (Kairakty)
    Kutzke, H., H. Klapper, S. Merlino, M. Pasero, N. Perchiazzi, and G. Eggert (2000) The crystal structure of barstowite, Pb4Cl6(CO3)•H2O, determined on crystals from Etruscan slags and from a Late-Hellenistic shipwreck. Zeits. Kristallogr., 215, 110-113.
    Tunisia
     
    • Mahdia Governorate
      • Mahdia
    Kutzke, H., Barbier, B., Becker, P. & Eggert, G. (1997): Barstowite as a corrosion product on a lead object from the Mahdia shipwreck. Studies in Conservation 42, 176-180.
    UK
     
    • England
      • Cornwall
        • Wadebridge District
          • St Endellion
    Min.Mag.(1991) 55, 121-125
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