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Christofschäferite-(Ce)

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Big Photo

Pumice quarries, Wingertsberg, Niedermendig, Mendig, Laach lake volcanic complex, Eifel, Rhineland-Palatinate, Germany
© C.H.M.-Schäfer

Show Christofschäferite-(Ce) Photos (2)



Formula:
(Ce,La,Ca)
 
4
Mn(Ti,Fe)
 
3
(Fe,Ti)(Si
 
2
O
 
7
)
 
2
O
 
8
System:MonoclinicColour:black
Hardness:6
Member of:Chevkinite Group
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)

IMA status:Approved 2012
mindat.org URL:http://www.mindat.org/min-42733.html
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Type Occurrence of Christofschäferite-(Ce)

Type Locality:Pumice quarries, Wingertsberg, Niedermendig, Mendig, Laach lake volcanic complex, Eifel, Rhineland-Palatinate, Germany
General Appearance of Type Material:coarse crystals and isolated anhedral grains
Place of Conservation of Type Material:Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4227/1
Year of Discovery:1982
Geological Setting of type material:Metasomatite, that formed at the contact of an alkali-rich magma and a Mn-rich rock

Physical Properties of Christofschäferite-(Ce)

Lustre: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 (measured):4,8(1) g/cm3
Density (calculated):4,85 g/cm3

Crystallography of Christofschäferite-(Ce)

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
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:
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°
Maximum Birefringence:δ = 0.105

Chart 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)
 
4
Mn(Ti,Fe)
 
3
(Fe,Ti)(Si
 
2
O
 
7
)
 
2
O
 
8
Essential elements:Ce, Fe, Mn, O, Si, Ti
All elements listed in formula:Ca, Ce, Fe, La, Mn, O, Si, Ti
Common Impurities:Al,Mg,Ca,Nb

Relationship of Christofschäferite-(Ce) to other Species

Member of:Chevkinite Group
Other Members of Group:

- +
Chevkinite-(Ce)
(Ce,La,Ca,Th)
 
4
(Fe
2+
 
,Mg)(Fe
2+
 
,Ti,Fe
3+
 
)
 
2
(Ti,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
Dingdaohengite-(Ce)
(Ce,La)
 
4
Fe
2+
 
(Ti,Fe
2+
 
,Mg,Fe
2+
 
)
 
2
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
Hezuolinite
(Sr,REE)
 
4
Zr(Ti,Fe
3+
 
)
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
Maoniupingite-(Ce)
(Ce,Ca)
 
4
(Fe
3+
 
,Ti,Fe
2+
 
,◻)(Ti,Fe
3+
 
,Fe
2+
 
,Nb)
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
Matsubaraite
Sr
 
4
Ti
 
5
(Si
 
2
O
 
7
)
 
2
O
 
8
Perrierite-(Ce)
(Ce,Ca,Th)
 
4
(Fe
2+
 
,Mg)Fe
3+
2
(Ti,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
Perrierite-(La)
(La,Ce,Ca)
 
4
(Fe,Mn
2+
 
,Mg)Fe
3+
2
(Ti,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
Polyakovite-(Ce)
(Ce,Ca)
 
4
(Mg,Fe
2+
 
)(Cr
3+
 
,Fe
3+
 
)
 
2
(Ti,Nb)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
Rengeite
Sr
 
4
ZrTi
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
Strontiochevkinite
(Sr,La,Ce,Ca)
 
4
Fe
2+
 
(Ti,Zr)
 
2
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
Strontium Perrierite
(Ce,Sr,La,Ca)
 
4
Fe
2+
 
(Ti,Zr,Fe)
 
2
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8

Other Names for Christofschäferite-(Ce)

Synonyms:
IMA2011-107
Other Languages:

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 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

Internet Links for Christofschäferite-(Ce)

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    • Localities for Christofschäferite-(Ce)

    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.
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    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.
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