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Mereheadite

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Formula:
Pb
 
47
Cl
 
25
(OH)
 
13
O
 
24
(CO
 
3
)(BO
 
3
)
 
2
Formula originally assumed to be Pb2O(OH)Cl.
System:MonoclinicColour:Pale yellow
Hardness:
Name:Named after Merehead quarry, Somerset, source of this and other unusual lead secondary minerals.


Related to symesite.

Classification of Mereheadite

IMA status:Approved
Strunz 8th edition ID:3/D.10-80
Nickel-Strunz 10th (pending) edition ID:3.DC.45

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
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Type Occurrence of Mereheadite

Type Locality:Torr Works Quarry (Merehead Quarry), Cranmore, Somerset, England, UK

Physical Properties of Mereheadite

Lustre:Vitreous, Resinous
Colour:Pale yellow
Streak:White
Hardness (Mohs):

Crystallography of Mereheadite

Crystal System:Monoclinic
Class (H-M):m - Domatic
Cell Parameters:a = 17.372(1) Å, b = 27.9419(19) Å, c = 10.6661(6) Å
β = 93.152(5)°
Ratio:a:b:c = 0.622 : 1 : 0.382
Unit Cell Volume:V 5169.6 ų
Comment:SG Cm; originally reported cell (Welch et al., 1998): C2/c, 5.680, 5.565, 13.143 A, 90.64°.

Optical Data of Mereheadite

Type:Biaxial
RI values: nα = 2.190 nγ = 2.280
Maximum Birefringence:δ = 0.090

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

Chemical Properties of Mereheadite

Formula:
Pb
 
47
Cl
 
25
(OH)
 
13
O
 
24
(CO
 
3
)(BO
 
3
)
 
2


Formula originally assumed to be Pb2O(OH)Cl.
Simplified for copy/paste:Pb47Cl25(OH)13O24(CO3)(BO3)2
Essential elements:B, C, Cl, H, O, Pb
All elements listed in formula:B, C, Cl, H, O, Pb

Relationship of Mereheadite 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.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

Other Names for Mereheadite

Synonyms:
IMA1996-045
Other Languages:
German:Mereheadit
Spanish:Mereheadita

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 Mereheadite

Reference List:

- +
Welch, M. D., Criddle, A. J. and Symes, R. F. (1998): Mereheadite, Pb2O(OH)Cl: a new litharge-related oxychloride from Merehead Quarry, Cranmore, Somerset. Mineralogical Magazine: 62: 387-393.

Krivovichev, S.V., Turner, R., Rumsey, M., Siidra, O.I., Kirk. C.A. (2009): The crystal structure and chemistry of mereheadite. Mineralogical Magazine, 73, 103-117.

Internet Links for Mereheadite

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  • Raman and XRD data at RRUFF project
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  • Mereheadite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Mereheadite specimens are currently listed for sale on minfind.com.
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  • Localities for Mereheadite

    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.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Wolfach
          • Oberwolfach
            • Rankach valley
    KOLITSCH, U. (2000): Eine durch Betoneinwirkung entstandene Paragenese von Blei-Verbindungen aus der Grube Clara im mittleren Schwarzwald. - Erzgräber 14, 48-53; WALENTA, K. (1999): Neue Mineralfunde von der Grube Clara. 8. Folge, 2. Teil. Lapis 24 (12), 40-44
    UK
     
    • England
      • Bristol
        • Westbury on Trym
    BMS Database
      • Somerset
        • Cranmore
    [Min.Mag.(1998) 62, 387-393; J. Russel Soc 2:2 p29]; Turner, R.W., (2005) A New Find of Lead Oxychlorides at Torr Works, Somerset. Russell Society Newsletter, No. 47, September 2005; 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; Krivovichev, S.V., Turner, R.W., Rumsey, M.S., Siidra, O.I. and Kirk, C.A. (2009). The crystal structure and chemistry of mereheadite. Mineralogical Magazine, 73, 75-89; Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46;
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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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