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Gagarinite-(Y)

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Big Photo

Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway
© Knut Eldjarn

Show Gagarinite-(Y) Photos (16)



Formula:
NaCaYF
 
6
System:HexagonalColour:Creamy, yellowish, pink.
Lustre:Vitreous, DullHardness:4½
Name:
For Yuri Gagarin (1934-1968), the first Russian cosmonaut.


Y-analogue of gagarinite-(Ce) and CaY-analogue of polezhaevaite-(Ce).

Classification of Gagarinite-(Y)

IMA status:Approved
Strunz 8th edition ID:3/A.08-40
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:11.5.6.1

11 : HALIDE COMPLEXES
5 : AmBX6
Hey's CIM Ref.:8.7.4

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
7 : Halides of the rare earth metals
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Type Occurrence of Gagarinite-(Y)

Type Locality:Verkhnee Espe Massif, Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts), Tarbagatai Range, Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast'), Kazakhstan

Occurrences of Gagarinite-(Y)

Geological Setting:In Na-metasomatized alkalic granites and syenites

Physical Properties of Gagarinite-(Y)

Lustre:Vitreous, Dull
Diaphaneity (Transparency):Transparent, Translucent
Colour:Creamy, yellowish, pink.
Streak:White
Hardness (Mohs):4½
Hardness (Vickers):VHN100=367 - 372
Tenacity:Brittle
Cleavage:Distinct/Good
Distinct in one direction, prismatic
Density (measured):4.11 - 4.29 g/cm3
Density (calculated):4.27 g/cm3

Crystallography of Gagarinite-(Y)

Crystal System:Hexagonal
Class (H-M):6/m - Dipyramidal
Space Group:P63/m
Cell Parameters:a = 5.987(2) Å, c = 3.5413(7) Å
Ratio:a:c = 1 : 0.591
Unit Cell Volume:V 109.93 ų (Calculated from Unit Cell)
Z:1
Morphology:Short and long prismatic hexagonal crystals, irregular grains, aggregates

Optical Data of Gagarinite-(Y)

Type:Uniaxial (+)
RI values: nω = 1.472 - 1.475 nε = 1.490 - 1.493
2V:Measured: 20°
Maximum Birefringence:δ = 0.018

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Comments:May be anomalously biaxial

Chemical Properties of Gagarinite-(Y)

Formula:
NaCaYF
 
6
Essential elements:Ca, F, Na, Y
All elements listed in formula:Ca, F, Na, Y

Relationship of Gagarinite-(Y) to other Species

Common Associates:
ZirconRiebeckite
Related Minerals - Nickel-Strunz Grouping):

- +
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.25IMA2009-014
SrF
 
2
3.AB.30Tveitite-(Y)
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42
3.AB.35Gagarinite-(Ce)
Na(REE
 
x
Ca
 
1-x
)(REE
 
y
Ca
 
1-y
)F
 
6
3.AB.35Polezhaevaite-(Ce)
NaSrCeF
 
6
Related Minerals - Hey's Index Grouping:

- +
8.7.1Fluocerite-(Ce)
(Ce,La)F
 
3
8.7.2Fluocerite-(La)
(La,Ce)F
 
3
8.7.3Tveitite-(Y)
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42

Other Names for Gagarinite-(Y)

Synonyms:
Nakalifite
Other Languages:
German:Nakalifit
Russian:Гагаринит-(Y)
Spanish:Nakalifita

Other Information

Other Information:Weakly magnetic
Special Storage/
Display Requirements:		Decomposed by water
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-(Y)

Reference List:

- +
American Mineralogist: 47: 805.

Doklady Akademii Nauk SSSR: 141: 954-957.

Doklady of the Academy of Sciences of the USSR, Earth Science Sections: 141: 1290-1293.

Canadian Mineralogist: 32: 563-565.

Internet Links for Gagarinite-(Y)

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    • Localities for Gagarinite-(Y)

    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.
    Hide Locality List
    (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.
    Brazil
     
    • Amazonas
      • Presidente Figueiredo
        • Pitinga mine
    		A. C. Bastos Neto, V. P. Pereira, L. H. Ronchi, E. F. de Lima and J. C. Frantz (2009): The world-class Sn, Nb, Ta, F (Y, REE, Li) deposit and the massive cryolite associated with the albite-enriched facies of the Madeira A-type granite, Pitinga mining district, Amazonas State, Brazil. Canadian Mineralogist 47, 1329-1357.
    Canada
     
    • Québec & Newfoundland and Labrador
    		Miller (1996), Can.Min.: 34:349-371; Salvi & Williams-Jones (1995); Am.Min.: 80:1031-1040; Miller (1990), Newfoundland Dept. of Mines & Energy Geol. Sur. Report 90-1: 171-182.
    Kazakhstan
     
    • Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast')
      • Tarbagatai Range
        • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
    		Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    DAN-SSSR,(1961) 141, 954-957; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    		http://geo.web.ru/druza/l-Kent.htm
    Norway
     
    • Oppland
      • Lunner
        • Nordmarka
    		Raade, G & Haug, J. (1980): Rare Fluorides from a soda granite in the Oslo Region, Norway. Mineralogical Record, 11,83-91
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
          • Mama River Basin
            • Maigunda River
    		Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
        • Chitinskaya Oblast'
      • Tuva Republic
    		no reference
    Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    Saudi Arabia
     
    • Mintaqah Tabuk
      • Midyan
    		Küster, D. (2009): Ore Geology Reviews 35, 68-86.
    USA
     
    • Washington
      • Okanogan Co.
        • Golden Horn Batholith
    		Micro Probe Volume VI Number 8; Rocks and Minerals, 66:6, p. 454
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