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Gagarinite-(Ce)

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Formula:
Na(REE
 
x
Ca
 
1-x
)(REE
 
y
Ca
 
1-y
)F
 
6
System:TrigonalColour:Colourless to light pink
Lustre:VitreousHardness:
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)

IMA status:Renamed approved 2010
Strunz 8th edition ID:3/A.08-45
Strunz 9th edition ID:3.AB.35
Nickel-Strunz 10th (pending) edition ID:3.AB.35

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
Dana 8th edition ID:11.5.6.2

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

Type Locality:Strange Lake complex (Lac Brisson complex), Québec & Newfoundland and Labrador, Canada

Physical Properties of Gagarinite-(Ce)

Lustre: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
Maximum Birefringence:δ = 0.020

Chart 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(REE
 
x
Ca
 
1-x
)(REE
 
y
Ca
 
1-y
)F
 
6
Simplified for copy/paste:Na(REExCa1-x)(REEyCa1-y)F6
Essential elements:Ca, F, Na
All elements listed in formula:Ca, F, Na

Relationship of Gagarinite-(Ce) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.AB.Fluorocronite
PbF
 
2
3.AB.05Tolbachite
CuCl
 
2
3.AB.10Coccinite
HgI
 
2
3.AB.15Sellaite
MgF
 
2
3.AB.20Chloromagnesite
MgCl
 
2
3.AB.20Lawrencite
(Fe
2+
 
,Ni)Cl
 
2
3.AB.20Scacchite
MnCl
 
2
3.AB.25Fluorite
CaF
 
2
3.AB.25Frankdicksonite
BaF
 
2
3.AB.25Strontiofluorite
SrF
 
2
3.AB.30Tveitite-(Y)
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42
3.AB.35Gagarinite-(Y)
NaCaYF
 
6
3.AB.35Polezhaevaite-(Ce)
NaSrCeF
 
6

Other Names for Gagarinite-(Ce)

Synonyms:
IMA1993-038Zajacite-(Ce)
Other Languages:
German:Zajacit-(Ce)

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 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)

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  • Localities for Gagarinite-(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.
    (TL) indicates type locality. ? 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.
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