Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

Moderate

Dispersion:

relatively strong

Reflectivity:

Wavelength	R₁ (%)	R₂ (%)
400nm	17.20%	17.95%
420nm	16.50%	17.40%
440nm	15.90%	16.90%
460nm	15.50%	16.50%
480nm	15.10%	16.10%
500nm	14.90%	15.80%
520nm	14.50%	15.50%
540nm	14.30%	15.30%
560nm	14.10%	15.20%
580nm	14.00%	15.00%
600nm	13.90%	14.90%
620nm	13.80%	14.80%
640nm	13.80%	14.80%
660nm	13.70%	14.70%
680nm	13.60%	14.65%
700nm	13.60%	14.60%

Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 17.95%.
R₁ shown in black, R₂ shown in red

Colour in reflected light:

Gray

Internal Reflections:

Light yellow

Pleochroism:

Non-pleochroic

Chemistry of MereheaditeHide

Mindat Formula:

Pb₄₇Cl₂₅(OH)₁₃O₂₄(CO₃)(BO₃)₂

Formula originally assumed to be Pb₂O(OH)Cl.

Element Weights:

Element	% weight
Pb	85.369 %
Cl	7.770 %
O	6.452 %
B	0.190 %
H	0.115 %
C	0.105 %

Calculated from ideal end-member formula.

Elements listed:

B, C, Cl, H, O, Pb - search for minerals with similar chemistry

Crystallography of MereheaditeHide

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 V:

5169.6 Å³

Comment:

SG Cm; originally reported cell (Welch et al., 1998): C2/c, 5.680, 5.565, 13.143 A, 90.64°.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014589	Mereheadite	Krivovichev S V, Turner R, Rumsey M, Sidra O I, Kirk C A (2009) The crystal structure and chemistry of mereheadite Mineralogical Magazine 73 103-117		2009	Merehead Quarry, Cranmore, Somerset, England	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Mereheadite'
loop_
_publ_author_name
'Krivovichev S V'
'Turner R'
'Rumsey M'
'Sidra O I'
'Kirk C A'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 73 
_journal_year 2009
_journal_page_first 103
_journal_page_last 117
_publ_section_title
;
 The crystal structure and chemistry of mereheadite
;
_database_code_amcsd 0014589
_chemical_compound_source 'Merehead Quarry, Cranmore, Somerset, England'
_chemical_formula_sum 'Pb47 Cl25 O46 C B2 H13'
_cell_length_a 17.372
_cell_length_b 27.9419
_cell_length_c 10.6661
_cell_angle_alpha 90
_cell_angle_beta 93.152
_cell_angle_gamma 90
_cell_volume 5169.563
_exptl_crystal_density_diffrn      7.328
_symmetry_space_group_name_H-M 'C 1 m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Pb1   0.85720   0.89881   0.41340   1.00000   0.02340
Pb2   0.16330   0.40752  -0.20850   1.00000   0.02460
Pb3  -0.23370   0.20451  -0.42390   1.00000   0.02300
Pb4   0.95560   0.00000   0.15100   1.00000   0.03900
Pb5   0.05500   0.30060  -0.01080   1.00000   0.02390
Pb6  -0.02550   0.20338  -0.43370   1.00000   0.02450
Pb7   0.68420   0.90091   0.15520   1.00000   0.02380
Pb8   0.37280   0.19248   0.40160   1.00000   0.02270
Pb9   0.47550   0.10024   0.19020   1.00000   0.02230
Pb10  -0.11590   0.09839  -0.24800   1.00000   0.02350
Pb11   0.27420   0.10202  -0.41090   1.00000   0.02210
Pb12   0.28950   0.00000   0.27690   0.92200   0.02310
Pb13  -0.10900   0.30524  -0.25340   1.00000   0.02150
Pb14   0.18150   0.00000   0.76270   1.00000   0.02550
Pb15   0.00010   0.39648  -0.44000   1.00000   0.02300
Pb16   0.36940   0.30180   0.06060   0.92500   0.01930
Pb17   0.07380   0.10482  -0.02310   1.00000   0.02800
Pb18   0.20550   0.19920   0.13200   1.00000   0.02860
Pb19   0.77270   0.00000   0.60240   1.00000   0.01960
Pb20   0.58710   0.19535   0.34950   1.00000   0.02320
Pb21  -0.22150   0.00000  -0.05170   1.00000   0.02330
Pb22   0.16360   0.19533  -0.22870   1.00000   0.02370
Pb23   0.56700   0.00000   0.01020   1.00000   0.02310
Pb24   0.29040   0.10332  -0.06900   1.00000   0.02350
Pb25   0.60480   0.00000   0.35850   1.00000   0.02460
Pb26   0.39000   0.00000   0.76480   1.00000   0.02100
Pb27   0.10060   0.10703  -0.64030   1.00000   0.02930
Pb28   0.98680   0.00000   0.56850   1.00000   0.03000
Cl1   0.17200   0.19830  -0.54900   1.00000   0.03400
Cl2  -0.02000   0.39890  -0.12200   1.00000   0.04200
Cl3   0.35900   0.00000   0.04100   1.00000   0.03300
Cl4   0.17900   0.00000   0.45700   1.00000   0.03800
Cl5   0.37500   0.40140   0.07800   1.00000   0.04100
Cl6   0.08500   0.10320  -0.32100   1.00000   0.04000
Cl7   0.09700   0.50000  -0.30300   1.00000   0.03500
Cl8   0.76300   0.00000   0.25700   1.00000   0.03900
Cl9   0.39380   0.19830   0.08100   1.00000   0.02500
Cl10   0.97700   0.00000   0.85800   1.00000   0.03200
Cl11   0.06400   0.30300  -0.35100   1.00000   0.02200
Cl12   0.26700   0.10210   0.24700   1.00000   0.03600
Cl13   0.48000   0.30150  -0.12500   1.00000   0.03400
Cl14   0.28900   0.29810   0.29300   1.00000   0.03400
Cl15   0.68100   0.89730   0.46800   1.00000   0.02000
Pb1A   0.18700   0.00000   0.15700   0.07800   0.02000
Pb2A   0.47400   0.30300   0.19400   0.07500   0.01800
O1  -0.11100   0.35900  -0.41000   1.00000   0.01400
O2   0.27300   0.15700  -0.25000   1.00000   0.01900
O3   0.28900   0.05300   0.75700   1.00000   0.03100
O4   0.58200   0.94600   0.20600   1.00000   0.01600
O5   0.57200   0.15300   0.15400   1.00000   0.02000
O6   0.17100   0.44600  -0.02500   1.00000   0.01100
O7  -0.13300   0.25400  -0.41700   1.00000   0.02600
O8  -0.00900   0.35700  -0.62500   1.00000   0.02200
O9  -0.13900   0.15210  -0.41700   1.00000   0.01000
O10   0.17600   0.15400  -0.04200   1.00000   0.01400
O11   0.77500   0.94800   0.76600   1.00000   0.01400
O12  -0.11200   0.05000  -0.41800   1.00000   0.01800
O-H1   0.17600   0.05000  -0.04900   1.00000   0.02800
O-H2  -0.02200   0.13600  -0.61100   1.00000   0.03200
O-H3   0.47800   0.24330   0.38600   1.00000   0.00800
O-H4   0.09300   0.15700   0.18400   1.00000   0.04000
O-H5   0.06400   0.05100   0.18600   1.00000   0.03600
O-H6   0.94800   0.00000   0.35400   1.00000   0.06200
O-H7   0.58500   0.25800   0.14500   1.00000   0.02800
C   0.42400   0.00000   0.46600   1.00000   0.06900
O1A   0.47000   0.00000   0.38500   1.00000   0.06900
O1B   0.40500   0.03700   0.52500   1.00000   0.06900
B  -0.27000   0.19800  -0.11600   1.00000   0.06900
O2A  -0.23800   0.17300  -0.19200   1.00000   0.06900
O2B  -0.28300   0.24000  -0.08500   1.00000   0.06900
O2C  -0.31100   0.16700  -0.05700   1.00000   0.06900
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Pb1 0.02700 0.02100 0.02300 0.00270 0.00400 0.00240
Pb2 0.03000 0.02200 0.02300 -0.00300 0.00200 -0.00090
Pb3 0.02200 0.02100 0.02700 0.00000 0.00500 0.00020
Pb4 0.05700 0.03100 0.03100 0.00000 0.00500 0.00000
Pb5 0.02600 0.02200 0.02400 -0.00130 0.00100 -0.00240
Pb6 0.02700 0.02300 0.02300 0.00230 0.00200 0.00140
Pb7 0.02200 0.02300 0.02600 -0.00060 0.00050 0.00100
Pb8 0.02400 0.02300 0.02100 -0.00290 -0.00070 -0.00040
Pb9 0.02000 0.02000 0.02700 -0.00090 0.00200 -0.00370
Pb10 0.02900 0.02100 0.02000 -0.00210 0.00020 0.00080
Pb11 0.02200 0.02300 0.02100 -0.00270 0.00200 -0.00200
Pb12 0.02600 0.02500 0.01900 0.00000 0.00500 0.00000
Pb13 0.02400 0.02100 0.01900 0.00350 -0.00200 -0.00270
Pb14 0.02400 0.01800 0.03400 0.00000 0.00200 0.00000
Pb15 0.02300 0.02200 0.02400 -0.00400 0.00050 0.00100
Pb16 0.01900 0.02000 0.01900 0.00100 0.00010 -0.00010
Pb17 0.02200 0.02600 0.03600 -0.00170 0.00050 -0.00700
Pb18 0.02500 0.02800 0.03300 0.00070 -0.00100 -0.00600
Pb19 0.02200 0.02200 0.01500 0.00000 0.00200 0.00000
Pb20 0.01900 0.02500 0.02600 -0.00100 -0.00070 0.00000
Pb21 0.01900 0.02700 0.02400 0.00000 -0.00030 0.00000
Pb22 0.02300 0.02200 0.02700 0.00200 0.00500 0.00160
Pb23 0.02100 0.02400 0.02400 0.00000 -0.00060 0.00000
Pb24 0.02400 0.02500 0.02200 0.00130 0.00070 -0.00300
Pb25 0.02500 0.02700 0.02200 0.00000 0.00500 0.00000
Pb26 0.01800 0.02100 0.02400 0.00000 0.00500 0.00000
Pb27 0.03500 0.03000 0.02400 -0.00300 0.00400 0.00100
Pb28 0.03100 0.02900 0.03100 0.00000 0.00500 0.00000
Cl1 0.04000 0.04000 0.01900 -0.02300 -0.00500 0.00300
Cl2 0.03800 0.02800 0.06100 -0.00600 0.01000 -0.00200
Cl3 0.05300 0.03600 0.00900 0.00000 -0.01000 0.00000
Cl4 0.04000 0.02200 0.05200 0.00000 0.01500 0.00000
Cl5 0.04800 0.02600 0.05100 -0.00200 0.02000 0.00400
Cl6 0.05200 0.02400 0.04800 0.00500 0.02100 0.01500
Cl7 0.02000 0.02700 0.06100 0.00000 0.02800 0.00000
Cl8 0.04500 0.03000 0.04400 0.00000 0.03100 0.00000
Cl9 0.00900 0.01900 0.04900 0.00400 0.01300 0.00300
Cl10 0.04700 0.03600 0.01200 0.00000 -0.01000 0.00000
Cl11 0.03700 0.01500 0.01500 -0.00300 -0.00300 -0.00100
Cl12 0.05000 0.02100 0.04000 0.00700 0.01700 -0.01100
Cl13 0.04200 0.03800 0.01900 0.00000 -0.00900 0.00100
Cl14 0.04100 0.01700 0.04500 -0.00800 0.02200 -0.00400
Cl15 0.01400 0.02900 0.01900 0.00700 0.00200 0.00000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.930 Å	(100)
3.785 Å	(48)
2.825 Å	(43)
6.581 Å	(37)
2.182 Å	(37)
2.780 Å	(36)
3.267 Å	(35)

Comments:

Merehead Quarry, Somerset, England. Data from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47c : [Carbonates, phosphates, borates, nitrates]
47e : [Vanadates, chromates, manganates]
47g : [Halogen-bearing surface weathering minerals]

Type Occurrence of MereheaditeHide

Type Locality:

ⓘ Torr Works Quarry, Cranmore, Mendip, Somerset, England, UK

General Appearance of Type Material:

Polycrystalline aggregates, up to 10 x 30 mm, in which individual grains are anhedral and rarely exceed 2 mm.

Place of Conservation of Type Material:

Natural History Museum, London, England, specimen BM 1965,285 and polished mount E.1175.

Geological Setting of Type Material:

Lead bearing lenses and cavities in veins of manganese and iron oxide minerals that cut through a sequence of dolomitic limestone.

Associated Minerals at Type Locality:

Mendipite	Blixite	Cerussite	Hydrocerussite	Calcite
Chloroxiphite	Paralaurionite	Parkinsonite	Datolite

Synonyms of MereheaditeHide

IMA1996-045

Unnamed (Pb Sulphate-Oxychloride)

Other Language Names for MereheaditeHide

Dutch:Mereheadiet

German:Mereheadit

Spanish:Mereheadita

Common AssociatesHide

Associations Based on Photo Data:

24 photos of Mereheadite associated with Mendipite	Pb₃Cl₂O₂
10 photos of Mereheadite associated with Chloroxiphite	Pb₃CuO₂Cl₂(OH)₂
9 photos of Mereheadite associated with Rickturnerite	Pb₇O₄[Mg(OH)₄](OH)Cl₃
7 photos of Mereheadite associated with Crednerite	Cu⁺Mn³⁺O₂
6 photos of Mereheadite associated with Parkinsonite	Pb₇MoO₉Cl₂
6 photos of Mereheadite associated with Paralaurionite	PbCl(OH)
3 photos of Mereheadite associated with Plumbonacrite	Pb₅O(OH)₂(CO₃)₃
3 photos of Mereheadite associated with Mimetite	Pb₅(AsO₄)₃Cl
3 photos of Mereheadite associated with Diaboleite	Pb₂CuCl₂(OH)₄
3 photos of Mereheadite associated with Symesite	Pb₁₀(SO₄)O₇Cl₄ · H₂O

Related Minerals - Strunz-mindat Grouping Hide

3.DC.	Gajardoite	KCa_0.5As³⁺₄O₆Cl₂ · 5H₂O	Hex. 6/mmm(6/m2/m2/m) : P6/mmm
3.DC.	Lucabindiite	(K,NH₄)As₄O₆(Cl,Br)	Hex. 6/mmm(6/m2/m2/m) : P6/mmm
3.DC.	Cuatrocapaite-(NH4)	(NH₄)₃(NaMg◻)(As₂O₃)₆Cl₆ · 16H₂O	Trig. 3m(32/m) : R3m
3.DC.	Cuatrocapaite-(K)	K₃(NaMg◻)(As₂O₃)₆Cl₆ · 16H₂O	Trig. 3m(32/m) : R3m
3.DC.	Napoliite	Pb₂OFCl	Tet. 4/mmm(4/m2/m2/m) : P4₂/mcm
3.DC.	Torrecillasite	Na(As,Sb)³⁺₄O₆Cl	Orth.
3.DC.05	Paralaurionite	PbCl(OH)	Mon. 2/m : B2/m
3.DC.05	Laurionite	PbCl(OH)	Orth. mmm(2/m2/m2/m)
3.DC.05	Mauriziodiniite	(NH₄)(As₂O₃)₂I	Hex. 6/mmm(6/m2/m2/m) : P6/mmm
3.DC.05	Russoite	(NH₄)ClAs₂O₃(H₂O)_0.5	Hex. 622 : P622
3.DC.10	Fiedlerite	Pb₃FCl₄(OH) · H₂O	Mon. 2/m
3.DC.15	Penfieldite	Pb₂Cl₃(OH)	Hex. 6 : P6
3.DC.15	Telluroperite	Pb₃TeO₄Cl₂	Orth. mmm(2/m2/m2/m)
3.DC.20	Laurelite	Pb₇F₁₂Cl₂	Hex. 6 : P6
3.DC.25	Zhangpeishanite	BaFCl	Tet. 4/mmm(4/m2/m2/m) : P4/nmm
3.DC.25	Matlockite	PbFCl	Tet. 4/mmm(4/m2/m2/m) : P4/nmm
3.DC.25	Zavaritskite	(BiO)F	Tet. 4/mmm(4/m2/m2/m) : P4/nmm
3.DC.25	Rorisite	CaFCl	Tet. 4/mmm(4/m2/m2/m) : P4/nmm
3.DC.25	Bismoclite	BiOCl	Tet. 4/mmm(4/m2/m2/m) : P4/nmm
3.DC.25	Vegrandisite	BaCl₂	Orth. mmm(2/m2/m2/m) : Pnma
3.DC.30	Nadorite	PbSbClO₂	Orth. mmm(2/m2/m2/m) : Cmcm
3.DC.30	Perite	PbBiClO₂	Orth. mmm(2/m2/m2/m) : Cmcm
3.DC.40	Thorikosite	Pb₃Cl₂(OH)(SbO₃,AsO₃)	Tet. 4/mmm(4/m2/m2/m) : I4/mmm
3.DC.50	Blixite	Pb₈O₅(OH)₂Cl₄	Orth.
3.DC.52	Rumseyite	Pb₂OClF	Tet. 4/mmm(4/m2/m2/m) : I4/mmm
3.DC.55	Vladkrivovichevite	[Pb₃₂O₁₈][Pb₄Mn₂O]Cl₁₄(BO₃)₈ · 2H₂O	Orth. mmm(2/m2/m2/m) : Pmmn
3.DC.55	Pinalite	Pb₃WO₅Cl₂	Orth. mmm(2/m2/m2/m)
3.DC.57	Yeomanite	Pb₂O(OH)Cl	Orth. mmm(2/m2/m2/m) : Pnma
3.DC.60	Symesite	Pb₁₀(SO₄)O₇Cl₄ · H₂O	Tric. 1 : P1
3.DC.60	'Lorettoite'	Pb₇O₆Cl₂	Orth.
3.DC.62	'Sarawakite (of Frenzel)'	Sb, O, Cl (?)
3.DC.65	Ecdemite	Pb₆As³⁺₂O₇Cl₄	Mon. 2 : P2₁
3.DC.70	Mendipite	Pb₃Cl₂O₂	Orth. 222 : P2₁2₁2₁
3.DC.75	Damaraite	Pb₃Cl(OH)O₂	Orth. mm2 : Pmc2₁
3.DC.80	Onoratoite	Sb₈Cl₂O₁₁	Tric. 1 : P1
3.DC.95	Barstowite	Pb₄Cl₆(CO₃) · H₂O	Mon. 2/m : P2₁/m

Fluorescence of MereheaditeHide

In UV light:

Not fluorescent.

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for MereheaditeHide

mindat.org URL:

https://www.mindat.org/min-2648.html
Please feel free to link to this page.

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Look for Mereheadite in the Rock H. Currier Digital Library

External Links:

Look for Mereheadite on Webmineral

Look for Mereheadite on Wikipedia

Look for Mereheadite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for MereheaditeHide

Reference List:

Welch, M. D., Criddle, A. J., Symes, R. F. (1998) Mereheadite, Pb₂O(OH)Cl: a new litharge-related oxychloride from Merehead Quarry, Cranmore, Somerset. Mineralogical Magazine, 62 (3) 387-393 doi:10.1180/002646198547657

Jambor, J.L., Pertsev, N.N., Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 1195-1198.

Krivovichev, S. V., Turner, R., RumseY, M., Siidra, O. I., Kirk, C. A. (2009) The crystal structure and chemistry of mereheadite. Mineralogical Magazine, 73 (1) 103-117 doi:10.1180/minmag.2009.073.1.103

(2017) Mereheadite. Handbook of Mineralogy. Mineralogical Society of America

Localities for MereheaditeHide

Showing 6 localities.

This 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.

Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Argentina
La Rioja Province General Lamadrid Department Villa Castelli ⓘ ~~Sierra de Cacho~~	Grundmann et al. (2018)
Mendoza Province Luján de Cuyo department Cacheuta District Sierra de Cacheuta Cerro de Cacheuta ⓘ Cacheuta Mine ?	Grundmann et al. (2018)

Germany
Baden-Württemberg Freiburg Region Ortenaukreis Oberwolfach ⓘ Clara Mine	Walenta (1999) +1 other reference
North Rhine-Westphalia Arnsberg Hochsauerlandkreis Brilon ⓘ Kunibert Mine	Rouse et al. (1990) +1 other reference

UK
England Bristol Westbury on Trym ⓘ Wesley Mine	Day (1999)
Somerset Mendip Cranmore ⓘ Torr Works Quarry (TL)	Alabaster (1989) +7 other references

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