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Christofschäferite-(Ce)

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Formula:
(Ce,La,Ca)4Mn(Ti,Fe)3(Fe,Ti)(Si2O7)2O8
System:
Monoclinic
Colour:
black
Hardness:
6
Name:
Named after Christof Schäfer (b. 1961), amateur mineralogist of Mayen-Kürrenberg, specialist in the minerals of the Eifel volcanic area, who discovered the mineral.
Mn2+-dominant member of the chevkinite group.

Classification of Christofschäferite-(Ce)

Approved 2012
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http://www.mindat.org/min-42733.html
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First Recorded Occurrence of Christofschäferite-(Ce)

General Appearance of First Recorded Material:
coarse crystals and isolated anhedral grains
Place of Conservation of First Recorded Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4227/1
Year of Discovery:
1982
Geological Setting of First Recorded Material:
Metasomatite, that formed at the contact of an alkali-rich magma and a Mn-rich rock

Physical Properties of Christofschäferite-(Ce)

Resinous
Diaphaneity (Transparency):
Translucent
Colour:
black
Streak:
brown
Hardness (Mohs):
6
Hardness Data:
Mohs hardness reference species
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4,8(1) g/cm3 (Measured)    4,85 g/cm3 (Calculated)

Crystallography of Christofschäferite-(Ce)

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Space Group Setting:
P21/m
Cell Parameters:
a = 13.3722(4) Å, b = 5.7434(1) Å, c = 11.0862(2) Å
β = 100.580(2)°
Ratio:
a:b:c = 2.328 : 1 : 1.93
Unit Cell Volume:
V 836.97 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.90 (39)
4.64 (65)
3.480 (78)
3.169 (81)
3.095 (43)
2.730 (100)
2.169 (46)
1.737 (46)

Optical Data of Christofschäferite-(Ce)

Type:
Biaxial (-)
RI values:
nα = 1.945 nβ = 2.015 nγ = 2.050
2V:
Measured: 70° , Calculated: 68°
Max Birefringence:
δ = 0.105
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none observed
Pleochroism:
Strong

Chemical Properties of Christofschäferite-(Ce)

Formula:
(Ce,La,Ca)4Mn(Ti,Fe)3(Fe,Ti)(Si2O7)2O8
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Mg,Ca,Nb

Relationship of Christofschäferite-(Ce) to other Species

Other Members of Group:
Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Dingdaohengite-(Ce)(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe2+)2Ti2(Si2O7)2O8
Hezuolinite(Sr,REE)4Zr(Ti,Fe3+)4(Si2O7)2O8
Maoniupingite-(Ce)(Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8
MatsubaraiteSr4Ti5(Si2O7)2O8
Perrierite-(Ce)(Ce,Ca,Th)4(Fe2+,Mg)Fe23+(Ti,Fe3+)2(Si2O7)2O8
Perrierite-(La)(La,Ce,Ca)4(Fe,Mn2+,Mg)Fe23+(Ti,Fe3+)2(Si2O7)2O8
Polyakovite-(Ce)(Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8
RengeiteSr4ZrTi4(Si2O7)2O8
Strontiochevkinite(Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8
Strontium Perrierite(Ce,Sr,La,Ca)4Fe2+(Ti,Zr,Fe)2Ti2(Si2O7)2O8

Other Names for Christofschäferite-(Ce)

Name in Other Languages:

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.

References for Christofschäferite-(Ce)

Reference List:
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Belakovskiy, D.I., Göttlicher, J., Britvin, S.N., Van, K.V. (2012) Christofschäferite-(Ce), IMA 2011-107. CNMNC Newsletter No. 13, June 2012, page 810; Mineralogical Magazine, 76, 807-817.

Aksenov, S.M., Rastsvetaeva, R.K., Chukanov, N.V.(2012): Crystal structure features of Christofschäferite-(Ce) a new mineral of chevkinite-group, ECM 2012, Norway.

Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Belakovskiy, D.I., Göttlicher, J., Britvin, S.N., Möckel, S. (2012) Christofschäferite (Ce), (Ce,La,Ca)4Mn2+(Ti,Fe3+)3(Fe3+,Fe2+,Ti)(Si2O7)2O8, a new chevkinite group mineral from the Eifel area, Germany. [Novye dannye o mineralakh] New Data on Minerals, 47, 33-42.

Internet Links for Christofschäferite-(Ce)

Localities for Christofschäferite-(Ce)

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
 
  • Rhineland-Palatinate
    • Eifel
      • Laach lake volcanic complex
        • Mendig
          • Niedermendig
            • Wingertsberg
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Belakovskiy, D.I., Göttlicher, J., Britvin, S.N., Van, K.V. (2012) Christofschäferite-(Ce), IMA 2011-107. CNMNC Newsletter No. 13, June 2012, page 810; Mineralogical Magazine, 76, 807-817; Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Belakovskiy, D.I., Göttlicher, J., Britvin, S.N., Möckel, S. (2012) Christofschäferite (Ce), (Ce,La,Ca)4Mn2+(Ti,Fe3+)3(Fe3+,Fe2+,Ti)(Si2O7)2O8, a new chevkinite group mineral from the Eifel area, Germany. [Novye dannye o mineralakh] New Data on Minerals, 47, 33-42.
Mineral and/or Locality  
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