Gagarinite-(Y) Mineral Data

Gagarinite-(Y) Mineral Data +

General Gagarinite-(Y) Information

Chemical Formula:

NaCaY(F,Cl)6

Composition:

Molecular Weight = 290.65 gm

Sodium 7.91 % Na 10.66 % Na₂O

Calcium 13.79 % Ca 19.29 % CaO

Yttrium 30.59 % Y 38.85 % Y₂O₃

Chlorine 18.30 % Cl 18.30 % Cl

- % Cl -4.13 % -O=Cl₂

Fluorine 29.41 % F 29.41 % F

- % F -12.39 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCaYF_4.5Cl_1.5

Environment:

Found in alkaline rocks.

IMA Status:

Approved IMA 1961

Locality:

Kazakhstan Link to MinDat.org Location Data.

Name Origin:

Named after Yuri Alekseevich Gagarin (1934-1968), the first cosmonaut and the first person to travel in space.

Synonym:

ICSD 39845

Nakalifite

PDF 15-69

Gagarinite-(Y) Image

Images:

Gagarinite-(Y)

Comments: Brownish to gray crystals of gagarinite-(Y) in matrix.
Location: Gjerdingen, Jevnaker, Oppland, Norway. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Gagarinite-(Y) Crystallography

Axial Ratios:

a:c = 1:0.58931

Cell Dimensions:

a = 5.99, c = 3.53, Z = 1; V = 109.69 Den(Calc)= 4.40

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.72(1), 2.09(0.9), 2.92(0.5),3(0.5), 1.13(0.3), 5.24(0.3), 1.96(0.2), 2.28(0.2),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Hughes J M , Drexler J W , The Canadian Mineralogist , 32 (1994) p.563-565, Refinement of the structure of gagarinite-(Y), Nax(CaxREE2-x)F6

Physical Properties of Gagarinite-(Y)

Cleavage:

[0001] Fair

Color:

Yellow, Cream white, Light brown, Pink.

Density:

4.21

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Dull

Magnetism:

Slightly magnetic

Streak:

white

Optical Properties of Gagarinite-(Y)

Gladstone-Dale:

CI meas= 0.423 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.448 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1095,KPDmeas= 0.1145,KC= 0.1985

Optical Data:

Uniaxial (+), w=1.472, e=1.492, bire=0.0200.

Calculated Properties of Gagarinite-(Y)

Electron Density:

r_electron=3.94 gm/cc
note: r_{Gagarinite-(Y)}=4.21 gm/cc.

Fermion Index

Fermion Index = 0.00018
Boson Index = 0.99982

Photoelectric:

PE_{Gagarinite-(Y)}= 41.66 barns/electron
U=PE_{Gagarinite-(Y)} x r_electron= 164.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gagarinite-(Y) is Not Radioactive

Gagarinite-(Y) Classification

Dana Class:

11.5.6.1 (11)Halide Complexes; Alumino-fluorides

(11.5)where (A)m B (X)6

(11.5.6)Dana Group

11.5.6.1 Gagarinite-(Y) NaCaY(F,Cl)6 P 3 3

Strunz Class:

III/A.08-40 III - Halogenides

III/A - Simple Halogenides, without water Metal : Halogen = 1 : 2, 1 : 3

III/A.08 - Fluorite series and related compounds

III/A.08-10 Fluorite CaF2 F m3m 4/m 3 2/m

III/A.08-20 Frankdicksonite BaF2 F m3m 4/m 3 2/m

III/A.08-25 Haleniusite-(La)! (La,Ce)OF F m3m 4/m 3 2/m

III/A.08-30 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono

III/A.08-40 Gagarinite-(Y) NaCaY(F,Cl)6 P 3 3

III/A.08-45 Zajacite-(Ce) Na(REExCa1-x)(REEyCa1-y)F6where(xney) P 3 3

III/A.08-50 Laurelite Pb7F12Cl2 P 6 6

III/A.08-60 Coccinite* HgI2(?) P 4₁/nmc 4/m 2/m 2/m

Other Gagarinite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Gagarinite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

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Gagarinite-(Y)

NaCaY(F,Cl)6
Dana No: 11.5.6.1 Strunz No: III/A.08-40
Locality:

Notes: