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Rumseyite

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About RumseyiteHide

Mike Rumsey
Formula:
Pb2OClF
Colour:
Pale orange-brown
Lustre:
Vitreous
Specific Gravity:
7.71 (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.
Related to other layered Pb oxyhalides.


Classification of RumseyiteHide

Approved
Approval Year:
2012
First Published:
2012

Pronounciation of RumseyiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of RumseyiteHide

Vitreous
Transparency:
Translucent
Colour:
Pale orange-brown
Streak:
White
Cleavage:
Perfect
on {100}
Density:
7.71 g/cm3 (Calculated)

Chemical Properties of RumseyiteHide

Formula:
Pb2OClF
IMA Formula:
[Pb2OF]Cl

Crystallography of RumseyiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.306 (17)
3.848 (41)
2.923 (100)
2.875 (68)
2.110 (12)
2.049 (10)
1.719 (9)
1.680 (14)

Type Occurrence of RumseyiteHide

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:

Synonyms of RumseyiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hydrocerussite1 photo of Rumseyite associated with Hydrocerussite on mindat.org.
Diaboleite1 photo of Rumseyite associated with Diaboleite on mindat.org.

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.

References for RumseyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Turner, R.W., Siidra, O.I., Krivovichev, S.V., Stanley, C.J. and Spratt. J. (2012) Rumseyite, IMA 2011-091. CNMNC Newsletter, 13(6), 808; Mineralogical Magazine, 76, 807-817.
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.

Internet Links for RumseyiteHide

Localities for RumseyiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
UK (TL)
 
  • England
    • Somerset
      • Cranmore
Turner, R.W., Siidra, O.I., Krivovichev, S.V., Stanley, C.J. and Spratt. J. (2012) Rumseyite, IMA 2011-091. CNMNC Newsletter, 13(6), 808; 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.
Mineral and/or Locality  
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