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Matlockite

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Formula:
PbFCl
System:TetragonalColour:Colourless, light yellow ...
Hardness:2½ - 3
Member of:Matlockite Group
Name:After the locality near Matlock, Derbyshire, England.


Matlockite Group.

An extremely rare secondary lead mineral.
May be confused with platy phosgenite.

Classification of Matlockite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/D.0-20
Nickel-Strunz 10th (pending) edition ID:3.DC.25

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Dana 8th edition ID:9.2.11.1

9 : NORMAL HALIDES
2 : AX2
Hey's CIM Ref.:8.8.2

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

Type Locality:Cromford, Derbyshire, England, UK
Year of Discovery:1851
Associated Minerals at type locality:
SphaleritePhosgeniteGalenaFluoriteCerussite
BaryteAnglesite

Physical Properties of Matlockite

Lustre:Adamantine, Pearly
Diaphaneity (Transparency):Transparent
Colour:Colourless, light yellow to light golden-yellow, greenish
Hardness (Mohs):2½ - 3
Cleavage:Perfect
On {001}.
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):7.12 g/cm3
Density (calculated):7.16 g/cm3

Crystallography of Matlockite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:P4/nmm
Cell Parameters:a = 4.11Å, c = 7.23Å
Ratio:a:c = 1 : 1.759
Unit Cell Volume:V 122.13 ų (Calculated from Unit Cell)
Morphology:Crystals usually tabular {001}; also as stout pyramidal crystals with smal prism faces. Subparallel aggregates of platy crystals; as hemispherical, rosette-like groups. Massive; coarsely lamellar.

Optical Data of Matlockite

Type:Uniaxial (-)
RI values: nω = 2.150 nε = 2.040
Maximum Birefringence:δ = 0.110

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Comments:Biaxial with small 2V at times, the result of subparallel growth or strain.

Chemical Properties of Matlockite

Formula:
PbFCl
Essential elements:Cl, F, Pb
All elements listed in formula:Cl, F, Pb

Relationship of Matlockite to other Species

Member of:Matlockite Group
Other Members of Group:

- +
Bismoclite
(BiO)Cl
Daubréeite
(BiO)(OH,Cl)
Laurionite
PbCl(OH)
Paralaurionite
PbCl(OH)
Rorisite
CaFCl
Zavaritskite
(BiO)F
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.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
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
8.8.3Laurelite
Pb
 
7
F
 
12
Cl
 
2
8.8.4Cotunnite
PbCl
 
2
8.8.5Mendipite
Pb
 
3
Cl
 
2
O
 
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 Matlockite

Synonyms:
Matlockite (of Greg)
Other Languages:
German:Matlockit
Russian:Матлокит
Spanish:Matlockita

Other Information

Thermal Behaviour:Melting point 601°.
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 Matlockite

Reference List:

- +
Greg (1851) Philosophical Magazine and Journal of Science: 2: 120.

Rammelsberg (1852) Annalen der Physik, Halle, Leipzig: 85: 141.

Sandonnini (1911) Gazzetta chimica italiana, Rome: 41: 144.

Goldschmidt, V. (1920) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 6: 12.

Nieuwenkamp (1933) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 86: 470.

Bannister (1934) Mineralogical Magazine: 23: 587.

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: 59-60.

Pasero, M. & Perchiazzi, N.(1996): Crystal structure refinement of matlockite. Mineralogical Magazine: 60: 833-836.

Internet Links for Matlockite

Search Engines:
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  • External Links:
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  • Look for Matlockite on Wikipedia
  • Look for Matlockite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Matlockite details from Handbook of Mineralogy (PDF)
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  • Localities for Matlockite

    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
     
    • Tasmania
      • Zeehan district
        • Zeehan mineral field
    Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
    Austria
     
    • Carinthia
      • Friesach - Hüttenberg area
        • Hüttenberg
          • Waitschach
    U. Kolitsch and H. Pristacz (2009): An orthorhombic dimorph of barstowite, Pb4Cl6(CO3)•H2O, from slags at Maria Waitschach, Austria, and Lavrion, Greece. Poster, Joint MinPet 2009 and 4th MSCC, Budapest, Hungary, September 7-11; abstract in Mitt. Österr. Mineral. Ges. 155, 83.; Kolitsch, U., Brandstätter, F., Schreiber, F., Fink, R. & Auer, C. (2013): Die Mineralogie der weltweit einzigartigen Schlacken von Waitschach, Kärnten. Annalen des Naturhistorischen Museums in Wien, Serie A, 115, 19-87 (in German).
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Sierra Gorda District
          • Caracoles
    Berman, Frondel & Palache
    • Tarapacá Region
      • El Tamarugal Province
    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: 60.
    China
     
    • Shandong Province
      • Linyi Prefecture
        • Yimeng Mtns (Yimeng Shan)
          • Mengyin Co.
            • Mengyin Kimberlite field
              • Changma Kimberlite belt
                • Wangcun deposit
    Gorshkov, A.I., Titkov, S.V., Yan Nan Bao, Ryabchikov, I.D., and Magazina, L.O. (2006): Geology of Ore Deposits 48(4), 326-334.
    France
     
    • Languedoc-Roussillon
      • Lozère
        • Marvejols
          • St Léger-de-Peyre
    Galvier J. et al. (1997), La mine de Sainte Lucie, Lozère (France), Le Règne Minéral, n° 18, pp: 5-36; Mineralogical Record 2011 42:0-32
    Germany
     
    • North Rhine-Westphalia
      • Ruhr Coal Mining area
        • Essen
    Weiss: "Mineralfundstellen, Deutschland West", 1990
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
    No reference listed
    Grolig, H. & Grolig, E. (1978): Lavrion in Attika. Lapis, 3 (5), 16-25; 40 (in German).
          • Oxygon area
    No reference listed
          • Passa Limani area
    Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals of the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Sounion area
    Elmar Lackner collection
    Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, (1996) Laurion: The Minerals in 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
          • Vrissaki area
    Lacroix, A. & De Schulten, A. (1908): Note sur des minéraux plombifères des scories athéniennes du Laurion. Bulletin de la Société française de Minéralogie et de Cristallographie, 31, 79-90 (in French).; Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands; Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (II). Mineralien-Welt 25 (2), 82-95 (in German).
    Italy
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
    M. Russo & I. Campostrini (2011): Ammineite, matlockite and post 1944 eruption fumarolic minerals at Vesuvius. Plinius 37, 312.
    • Tuscany
      • Livorno Province
        • Campiglia Marittima
    Int. Assoc. of Collectors of Slag Minerals, 10 (2), 4-6.
          • Sassetta
    Jansen, H. & van den Berg, W. (1998): Slakkenmineralen in Toscane (Italië). Gea, no. 4, 109-117 (in Dutch).
        • Piombino
    Cerutti, G. and Preite, D. (1995): Mineralien der etruskischen Schlacken von Baratti, Toskana. Lapis, 20 (4), 13-18; 50 (in German).
    Luigi Chiappino data
    South Africa
     
    • Mpumalanga Province
      • Nkangala District
        • Delmas
    Minerals of South Africa
    UK
     
    • England
      • Cornwall
        • St Agnes District
          • Crantock
    BMS Newsletter 79, March 2010 (http://britishmicromountsociety.homestead.com/Gannell-Smelter.html)
      • Derbyshire
    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, Vol. 2, 60
    Jones, J. (1982): Bulletin of the Peak District Mines Historical Society 8(4), 260-261; Ford, T.D., Sarjeant, W.A.S., and Smith, M.E. (1993): UK Journal of Mines and Minerals 13, 16-55
      • Staffordshire
        • Ecton
          • Back of Ecton
    XRD Univesity of Manitoba 2011
    USA
     
    • Arizona
      • Gila Co.
        • Globe-Miami District
          • Globe Hills District
            • Globe Hills
              • Burch area
                • Radium
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141, 146, 291; Bideaux, R.A., et al (1960), Some new occurrences of minerals of Arizona, AZ Geol. Soc. Digest: 3: 53-56.
      • Pima Co.
        • Tohono O'odom (Papago) Indian Reservation
          • Comobabi Mts
            • Cababi District (Comobabi District)
              • Ko Vaya
                • Mildren Mine group
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 278, 291.
      • Pinal Co.
        • Mammoth District
          • Tiger
            • St. Anthony deposit
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 135, 141; Williams, S.A. (1970a), Bideauxite, a new Arizona mineral, Min.Mag.: 37: 637-640; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 44.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 291; Bideaux, R.A. (1980), Tiger, Arizona, Min.Rec.: 11: 155-181; Fahey, J.J., et al (1950), Wherryite, a new mineral from the Mammoth mine, AZ, Am.Min.: 35: 93-98.
    • Nevada
      • Elko Co.
        • Spruce Mountain District
    NBMG Spec. Pub. 31 Minerals of Nevada
    • South Dakota
      • Lawrence Co.
    R&M 75:3 pp 156-169
          • Spearfish
    SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
    Zimbabwe
     
    • Mashonaland West
      • Kadoma District
    Vetter, U., Weck, H.-D., Weale, T., Klosa, D., Wittich, C. and Hoffmann, K. (1999): A provisional inventory of the Sanyati oxide-zone minerals, Zimbabwe. Z. Angew. Geol. 45, 15-21.
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