Rumseyite
A valid IMA mineral species
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About Rumseyite
Mike Rumsey
Formula:
Pb2OClF
Colour:
Pale orange-brown
Lustre:
Vitreous
Specific Gravity:
7.838 (Calculated)
Crystal System:
Tetragonal
Name:
Named in honour of Michael Scott (Mike) Rumsey (1980- ), Senior Curator in Charge of the Mineral and Planetary Sciences Division at the Natural History Museum, London, who discovered the mineral.
Type Locality:
Related to other layered Pb oxyhalides.
Unique Identifiers
Mindat ID:
42723
Long-form identifier:
mindat:1:1:42723:0
Similar Names
| Ramsayite | A synonym of Lorenzenite |
IMA Classification of Rumseyite
Approved
IMA Formula:
Pb2+2OFCl
Approval year:
2012
First published:
2012
Type description reference:
Classification of Rumseyite
3.DC.52
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rum | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Rumseyite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Rumseyite
Vitreous
Transparency:
Translucent
Colour:
Pale orange-brown
Streak:
White
Cleavage:
Perfect
on {100}
on {100}
Density:
7.838 g/cm3 (Calculated)
Optical Data of Rumseyite
Type:
Uniaxial
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 470nm | 14.6% |
| 546nm | 13.6% |
| 589nm | 13.4% |
| 650nm | 13.2% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 14.6%.
Comments:
Mean refractive index (calculated at 589 nm) is 2.106
Chemistry of Rumseyite
Mindat Formula:
Pb2OClF
Element Weights:
Elements listed:
Crystallography of Rumseyite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Setting:
I4/mmm
Cell Parameters:
a = 4.065(1) Å, c = 12.631(7) Å
Ratio:
a:c = 1 : 3.107
Unit Cell V:
208.7 ų
Z:
2
Comment:
Aurivillius structure type
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0019618 | Rumseyite | Turner R W, Siidra O I, Krivovichev S V, Stanley C J, Spratt J (2012) Rumseyite, [Pb2OF]Cl, the first naturally occurring fluoroxychloride mineral with the parent crystal structure for layered lead oxychlorides Mineralogical Magazine 76 1247-1255 | 2012 | Merehead quarry, Somerset, England | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.306 Å | (17) |
| 3.848 Å | (41) |
| 2.923 Å | (100) |
| 2.875 Å | (68) |
| 2.110 Å | (12) |
| 2.049 Å | (10) |
| 1.719 Å | (9) |
| 1.680 Å | (14) |
Reference:
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Rumseyite
General Appearance of Type Material:
Found in a small cavity in ‘hydrocerussite’ from a manganese pod. Three specimens of the species have been identified (2018), one of which has been sampled to provide a few tiny fragments. The original specimen BM 1970,110 is at the NHM and the other two
Place of Conservation of Type Material:
Natural History Museum, London, UK, catalogue number BM1970,110
Geological Setting of Type Material:
Manganese pod
Associated Minerals at Type Locality:
Reference:
Synonyms of Rumseyite
Other Language Names for Rumseyite
Common Associates
Associations Based on Photo Data:
| 1 photo of Rumseyite associated with Hydrocerussite | Pb3(CO3)2(OH)2 |
| 1 photo of Rumseyite associated with Diaboleite | Pb2CuCl2(OH)4 |
Related Minerals - Strunz-mindat Grouping
| 3.DC. | Gajardoite | KCa0.5As3+4O6Cl2 · 5H2O |
| 3.DC. | Lucabindiite | (K,NH4)As4O6(Cl,Br) |
| 3.DC. | Cuatrocapaite-(NH4) | (NH4)3(NaMg◻)(As2O3)6Cl6 · 16H2O |
| 3.DC. | Cuatrocapaite-(K) | K3(NaMg◻)(As2O3)6Cl6 · 16H2O |
| 3.DC. | Napoliite | Pb2OFCl |
| 3.DC. | Torrecillasite | Na(As,Sb)3+4O6Cl |
| 3.DC.05 | Paralaurionite | PbCl(OH) |
| 3.DC.05 | Laurionite | PbCl(OH) |
| 3.DC.05 | Mauriziodiniite | (NH4)(As2O3)2I |
| 3.DC.05 | Russoite | (NH4)ClAs2O3(H2O)0.5 |
| 3.DC.10 | Fiedlerite | Pb3FCl4(OH) · H2O |
| 3.DC.15 | Penfieldite | Pb2Cl3(OH) |
| 3.DC.15 | Telluroperite | Pb3TeO4Cl2 |
| 3.DC.20 | Laurelite | Pb7F12Cl2 |
| 3.DC.25 | Zhangpeishanite | BaFCl |
| 3.DC.25 | Matlockite | PbFCl |
| 3.DC.25 | Zavaritskite | (BiO)F |
| 3.DC.25 | Rorisite | CaFCl |
| 3.DC.25 | Bismoclite | BiOCl |
| 3.DC.25 | Vegrandisite | BaCl2 |
| 3.DC.30 | Nadorite | PbSbClO2 |
| 3.DC.30 | Perite | PbBiClO2 |
| 3.DC.40 | Thorikosite | Pb3Cl2(OH)(SbO3,AsO3) |
| 3.DC.45 | Mereheadite | Pb47Cl25(OH)13O24(CO3)(BO3)2 |
| 3.DC.50 | Blixite | Pb8O5(OH)2Cl4 |
| 3.DC.55 | Vladkrivovichevite | [Pb32O18][Pb4Mn2O]Cl14(BO3)8 · 2H2O |
| 3.DC.55 | Pinalite | Pb3WO5Cl2 |
| 3.DC.57 | Yeomanite | Pb2O(OH)Cl |
| 3.DC.60 | Symesite | Pb10(SO4)O7Cl4 · H2O |
| 3.DC.60 | 'Lorettoite' | Pb7O6Cl2 |
| 3.DC.62 | 'Sarawakite (of Frenzel)' | Sb, O, Cl (?) |
| 3.DC.65 | Ecdemite | Pb6As3+2O7Cl4 |
| 3.DC.70 | Mendipite | Pb3Cl2O2 |
| 3.DC.75 | Damaraite | Pb3Cl(OH)O2 |
| 3.DC.80 | Onoratoite | Sb8Cl2O11 |
| 3.DC.95 | Barstowite | Pb4Cl6(CO3) · H2O |
Other Information
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 Rumseyite
mindat.org URL:
https://www.mindat.org/min-42723.html
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References for Rumseyite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2012) New minerals and nomenclature modifications approved in 2012. CNMNC Newsletter No 13. Mineralogical Magazine, 76 (3) 807-817 doi:10.1180/minmag.2012.076.3.26
Turner, R. W., Siidra, O. I., Krivovichev, S. V., Stanley, C. J., Spratt, J. (2012) Rumseyite, [Pb2OF]Cl, the first naturally occurring fluoroxychloride mineral with the parent crystal structure for layered lead oxychlorides. Mineralogical Magazine, 76 (5) 1247-1255 doi:10.1180/minmag.2012.076.5.11
Siidra, O. I., Turner, R. W., Krivovichev, S. V., Spratt, J. (2012) Rumseyite, [Pb2OF]Cl – fluoroxychloride mineral with the parent crystal structure for layered lead oxychlorides. Acta Crystallographica Section A Foundations of Crystallography, 68. doi:10.1107/s0108767312096201
Turner, R. W., Siidra, O. I., Krivovichev, S. V., Stanley, C. J., Spratt, J. (2012) Rumseyite, [Pb2OF]Cl, the first naturally occurring fluoroxychloride mineral with the parent crystal structure for layered lead oxychlorides. Mineralogical Magazine, 76 (5) 1247-1255 doi:10.1180/minmag.2012.076.5.11
Kasatkin, Anatoly V., Siidra, Oleg I., Nestola, Fabrizio, Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Chukanov, Nikita V., Nazarchuk, Evgeny V., Molinari, Simone, Rossi, Manuela (2023) Napoliite, Pb2OFCl, a new mineral from Vesuvius volcano, and its relationship with dimorphous rumseyite. Mineralogical Magazine, 87 (5) 711-718 doi:10.1180/mgm.2023.43
Localities for Rumseyite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
UK (TL) | |
| Turner et al. (2012) +1 other reference |
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Torr Works Quarry, Cranmore, Mendip, Somerset, England, UK