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Gagarinite-(Ce)

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Yurii Alexeevich Gagarin - the first man visited space.
Formula:
Na(REExCa1-x)(REEyCa1-y)F6
System:
Trigonal
Colour:
Colourless to light pink
Lustre:
Vitreous
Hardness:
Name:
For Yuri Gagarin (1934-1968), the first Russian cosmonaut.
Original name (zajacite-(Ce)): For Dr. Ihor Stephan Zajac (1935- ), the geologist who lead the exploration group that discovered the Strange Lake deposit and who first recognized the mineral.
Renamed in 2010 (IMA 10-C); the original name "zajacite-(Ce)" is discredited.

Ce-analogue of gagarinite-(Y).

Classification of Gagarinite-(Ce)

Renamed approved 2010
3.AB.35

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
11.5.6.2

11 : HALIDE COMPLEXES
5 : AmBX6
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First Recorded Occurrence of Gagarinite-(Ce)

Physical Properties of Gagarinite-(Ce)

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless to light pink
Hardness (Mohs):

Crystallography of Gagarinite-(Ce)

Crystal System:
Trigonal

Optical Data of Gagarinite-(Ce)

Type:
Uniaxial (+)
RI values:
nω = 1.483 nε = 1.503
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Gagarinite-(Ce)

Formula:
Na(REExCa1-x)(REEyCa1-y)F6
Essential elements:
All elements listed in formula:

Relationship of Gagarinite-(Ce) to other Species

3.AB.FluorocronitePbF2
3.AB.05TolbachiteCuCl2
3.AB.10CocciniteHgI2
3.AB.15SellaiteMgF2
3.AB.20ChloromagnesiteMgCl2
3.AB.20Lawrencite(Fe2+,Ni)Cl2
3.AB.20ScacchiteMnCl2
3.AB.25FluoriteCaF2
3.AB.25FrankdicksoniteBaF2
3.AB.25StrontiofluoriteSrF2
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6F42
3.AB.35Gagarinite-(Y)NaCaYF6
3.AB.35Polezhaevaite-(Ce)NaSrCeF6

Other Names for Gagarinite-(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 Gagarinite-(Ce)

Reference List:
SCIBERRAS, M.J., LEVERETT, P., WILLIAMS, P.A., HIBBS, D.E., ROBERTS, A.C. & GRICE, J.D. (2011) The single-crystal X-ray study of zajacite-(Ce) and the redefinition of zajazite-(Ce) as gagarinite-(Ce). Canadian Mineralogist 49, 1111-1114.

Internet Links for Gagarinite-(Ce)

Localities for Gagarinite-(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.
Canada
 
  • Québec & Newfoundland and Labrador
SCIBERRAS, M.J., LEVERETT, P., WILLIAMS, P.A., HIBBS, D.E., ROBERTS, A.C. & GRICE, J.D. (2011) The single-crystal X-ray study of zajacite-(Ce) and the redefinition of zajazite-(Ce) as gagarinite-(Ce). Canadian Mineralogist 49, 1111-1114.; SCIBERRAS, M.J., LEVERETT, P., WILLIAMS, P.A., HIBBS, D.E., ROBERTS, A.C. & GRICE, J.D. (2011) The single-crystal X-ray study of zajacite-(Ce) and the redefinition of zajazite-(Ce) as gagarinite-(Ce). Canadian Mineralogist 49, 1111-1114.
Mineral and/or Locality  
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