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Mendipite

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Formula:
Pb
 
3
Cl
 
2
O
 
2
System:OrthorhombicColour:Colourless, white, grey, ...
Hardness:2½ - 3
Name:After the locality at the Mendip Hills, Somerset, England, UK.


Chemically similar to damaraite.

Classification of Mendipite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/D.10-30
Nickel-Strunz 10th (pending) edition ID:3.DC.70

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Dana 8th edition ID:10.3.1.1

10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
Hey's CIM Ref.:8.8.5

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
8 : Halides of Pb
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Type Occurrence of Mendipite

Type Locality:Churchill, Mendip Hills, Somerset, England, UK
Year of Discovery:1839
Associated Minerals at type locality:
WadPyromorphiteMalachiteHydrocerussiteDiaboleite
ChloroxiphiteCerussiteCalcite

Physical Properties of Mendipite

Lustre:Adamantine, Resinous, Silky, Pearly
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless, white, grey, often tinged yellow, blue, red; nearly colourless in transmitted light
Streak:White
Hardness (Mohs):2½ - 3
Cleavage:Perfect
On {110} perfect; {100} and {010} less perfect.
Fracture:Irregular/Uneven, Conchoidal
Density (measured):7.24 g/cm3
Density (calculated):7.22 g/cm3

Crystallography of Mendipite

Crystal System:Orthorhombic
Class (H-M):2 2 2 - Disphenoidal
Space Group:P21 21 21
Cell Parameters:a = 9.52Å, b = 11.87Å, c = 5.87Å
Ratio:a:b:c = 0.802 : 1 : 0.495
Unit Cell Volume:V 663.32 ų (Calculated from Unit Cell)
Z:4
Morphology:Fibrous or columnar masses, often radiated.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
d-spacingIntensity
7.40 (6)
3.78 (6)
3.51 (7)
3.08 (6)
3.04 (8)
2.78 (10)
2.64 (9)

Optical Data of Mendipite

Type:Biaxial (+/-)
RI values: nα = 2.240 nβ = 2.270 nγ = 2.310
2V:Measured: 90° , Calculated: 84°
Maximum Birefringence:δ = 0.070

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

Chemical Properties of Mendipite

Formula:
Pb
 
3
Cl
 
2
O
 
2
Simplified for copy/paste:Pb3Cl2O2
Essential elements:Cl, O, Pb
All elements listed in formula:Cl, O, Pb

Relationship of Mendipite 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.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
3.DC.95Barstowite
Pb
 
4
Cl
 
6
(CO
 
3
) · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
8.8.1Abhurite
Sn
 
21
Cl
 
16
(OH)
 
14
O
 
6
8.8.2Matlockite
PbFCl
8.8.3Laurelite
Pb
 
7
F
 
12
Cl
 
2
8.8.4Cotunnite
PbCl
 
2
8.8.6Damaraite
Pb
 
3
Cl(OH)O
 
2
8.8.7Laurionite
PbCl(OH)
8.8.8Paralaurionite
PbCl(OH)
8.8.9Penfieldite
Pb
 
2
Cl
 
3
(OH)
8.8.10Fiedlerite
Pb
 
3
FCl
 
4
(OH) · H
 
2
O
8.8.11Blixite
Pb
 
2
(O,OH)
 
2
Cl
8.8.12Pseudocotunnite
K
 
2
PbCl
 
4
8.8.13Diaboleite
Pb
 
2
CuCl
 
2
(OH)
 
4
8.8.14Pseudoboleite
Pb
 
31
Cu
 
24
Cl
 
62
(OH)
 
48
8.8.15Chloroxiphite
Pb
 
3
CuO
 
2
Cl
 
2
(OH)
 
2
8.8.17Bideauxite
Pb
 
2
AgCl
 
3
(F,OH)
 
2
8.8.18Boleite
KPb
 
26
Ag
 
9
Cu
 
24
(OH)
 
48
Cl
 
62
8.8.19Aravaipaite
Pb
 
3
F
 
3
[AlF
 
6
] · H
 
2
O
8.8.20Yedlinite
Pb
 
6
Cr
3+
 
Cl
 
6
(O,OH,H
 
2
O)
 
8
8.8.21Kolarite
PbTeCl
 
2
8.8.22Hematophanite
Pb
 
4
Fe
 
3
O
 
8
(OH,Cl)

Other Names for Mendipite

Synonyms:
Berzélite (of Lévy)CerasineCerasite (of Breithaupt)Chloride of LeadChurchillite
Flaky and Striated Lead-oreMuriate of LeadPeritomous Lead-barytePseudomendipite
Other Languages:
French:Plomb chloruré
German:Chlor-Spath
Churchillit
Mendipit
Salzsaures Blei
Latin:Minera plumbi calciformis
Russian:Мендипит
Simplified Chinese:白氯铅矿
Spanish:Churchillita
Mendipita
Swedish:Saltsyradt Bly
Traditional Chinese:白氯鉛礦

Other Information

Other Information:Soluble in dilute nitric acid.
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 Mendipite

Reference List:

- +
Berzelius (1823) Svenska Vetenskapsakademien, Stockholm, Handlingar: 184.

Berzelius (1824) Edinburgh Journal of Science: 1: 379.

Haidinger (1825) Mohs: 2: 151.

Beudant, F.S. (1832), Trailé élémentaire de Minéralogie, second edition, 2 volumes: 2: 502.

Breithaupt, A. (1832) Vollständige Characteristik etc. 2nd. Ed.: 61 (as Chlor-Spath).

Lévy, A. (1837) Description d’une collection de minéraux formée par M. Henri Heuland, et appartenant à M. Ch. H. Turner, de Rooksnest, dans le comté de Surrey en Angleterre. 3 volumes and atlas of 85 plates, London: 2: 448 (as Berzélite).

Glocker, E.F. (1839) Handbuch der Mineralogie, 2nd. edition, Nürnberg.: 604.

Dufrénoy (1856): 3: 280.

Rimann (1918) Anal. soc. quim. argentina: 6: 326 (as Pseudomendipite).

Spencer (1923) Mineralogical Magazine: 20: 67.

Bannister (1934) Mineralogical Magazine: 23: 596.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 56-58.

Gabrielson, O. (1958) The crystal structure of mendipite, Pb3O2Cl2. Arkiv Mineral. Geol., 2(16), 299–304.

Arkiv för Mineralogi och Geologi (1969): 4: 523.

Vincent, H. and Perrault, G. (1971): Structure cristalline de l’oxychlorure de plomb synthétique Pb3O2Cl2. Bulletin de la Société française de Minéralogie et de Cristallographie 94, 323–331.

Symes, R.F. and Embrey, P.G. (1977): Mendipite and other rare oxychloride minerals from the Mendip Hills, Somerset, England. Mineral. Record, 8, 298–303.

Neues Jahrbuch für Mineralogie, Monatshefte (2000): 563-569.

Krivovichev, Sergey V.; Burns, Peter C. (2001): Crystal chemistry of lead oxide chlorides. I. Crystal structures of synthetic mendipite, Pb3O2Cl2, and synthetic damaraite, Pb3O2(OH)Cl. Eur. J. Mineral. 13, 801-809.

Internet Links for Mendipite

Search Engines:
  • Look for Mendipite on Google
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  • External Links:
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  • Look for Mendipite on Athena Mineralogy
  • Look for Mendipite on Wikipedia
  • Look for Mendipite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mendipite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Wilensky Fine Minerals
  • Search for Mendipite on Well-Arranged Molecules
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Rare and Unusual minerals at Mineralogical Research Company
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Mendipite specimens for sale - minfind.com
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  • Specimens:The following Mendipite specimens are currently listed for sale on minfind.com.

    Localities for Mendipite

    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.
    Australia
     
    • New South Wales
      • Robinson Co.
        • Cobar
    Scott, K. M. (1994): Lead oxychlorides at Elura, western NSW, Australia. Mineralogical Magazine 58, 336-338.; Chapman, J. & Scott, K. (2005): Supergene minerals from the oxidised zone of the Elura (Endeavor) lead-zinc-silver deposit. Australian Journal of Mineralogy, 11, 83-90.
    • South Australia
      • Mt Lofty Ranges
        • South Mt Lofty Ranges (Adelaide Hills)
          • Clarendon
    Bywater, S. (1987): Minerals from the Mount Malvern mine. Mineralogical News (Journal of the Mineralogical Society of South Australia), 7 (1), 41.; Kolitsch, U. and Elliott, P. (1999): Mineralogy of the Mount Malvern Mine near Clarendon, South Australia. Australian J. Mineral. 5, 3-17.
    Germany
     
    • North Rhine-Westphalia
      • Ruhr Coal Mining area
        • Marl
          • Marl-Hüls
    Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Sauerland
        • Brilon
    Rhodius, R. (1847): Justus Liebig's Annalen der Chemie und Pharmacie 62, 373, Naumann, Zirkel: "Elemente der Mineralogie", 13th Ed., Engelmann (Leipzig), 1898; 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: 57.
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
    Schnorrer-Köhler, G. (1980): Mendipit Pb3Cl2O2 - Neufund für Lavrion, Griechenland. Der Aufschluss, 31 (5), 153-155.
          • Passa Limani area
    Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals of the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Thorikos area
    Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
    Kazakhstan
     
    • Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast')
    Pilipenko, P. P. (1915): Mineralogy of the Western Altai. Bull. Imp. Tomsk University, Tomsk, no. 63.
    Sweden
     
    • Värmland
      • Filipstad
    Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
    UK
     
    • England
      • Bristol
        • Westbury on Trym
    BMS Database
      • Cornwall
        • St Agnes District
          • Crantock
    BMS Newsletter 79, March 2010 (http://britishmicromountsociety.homestead.com/Gannell-Smelter.html)
      • Somerset
        • Cranmore
    Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46; Turner, R.W., (2006) A Mechanism for the formation of the Mineralised Mn Deposits at Merehead Quarry, Cranmore, Somerset, England. Min. Mag. vol. 70, no. 6, pp 629 - 653; Mineralogical Magazine 1977 41 : 410-411
        • Holwell
    BMS Database
        • Mendip Hills
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; 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: 57.
          • Priddy
    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: 57; Mineralogical Record: 27: 253.
    USA
     
    • Massachusetts
      • Hampshire Co.
        • Easthampton
    Gleba, 1978. Massachusetts Mineral & Fossil Localities
    • Pennsylvania
      • Chester Co.
        • Schuylkill Township
    MinRec 20:369-386
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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