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Polezhaevaite-(Ce)

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Formula:
NaSrCeF6
Colour:
snowy white
Lustre:
Silky
Hardness:
3
Specific Gravity:
4.646 (Calculated)
Crystal System:
Hexagonal
Name:
In honor of Lyudmila Ivanovna Polezhaeva (b. 1935), a Russian expert in electron microprobe analysis of minerals for her contribution to the mineralogy of alkaline rocks
Sr-Ce analogue of gagarinite-(Y).


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Classification of Polezhaevaite-(Ce)Hide

Approved
Approval Year:
2009
3.AB.35

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
11.5.6.3

11 : HALIDE COMPLEXES
5 : AmBX6

Physical Properties of Polezhaevaite-(Ce)Hide

Silky
Transparency:
Transparent, Translucent
Colour:
snowy white
Streak:
white
Hardness:
Comment:
for aggregates
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Splintery
Density:
4.646 g/cm3 (Calculated)

Optical Data of Polezhaevaite-(Ce)Hide

Type:
Uniaxial (+)
RI values:
nω = 1.490() nε = 1.497(5)
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Polezhaevaite-(Ce)Hide

Formula:
NaSrCeF6

Crystallography of Polezhaevaite-(Ce)Hide

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 6.207(7) Å, c = 3.801(9) Å
Ratio:
a:c = 1 : 0.612
Unit Cell V:
126.82 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.416 (40)
3.120 (100)
2.198 (70)
1.796 (90)
1.554 (30)
1.387 (30)
1.304 (30)
1.173 (70)

Type Occurrence of Polezhaevaite-(Ce)Hide

General Appearance of Type Material:
parallel and sheaf-like aggregates of extremely thin fibers (up to 1 mm long and <1 μm thick), which fill leaching voids within burbankite crystals
Geological Setting of Type Material:
natrolitized microcline-aegirine-sodalite lens within apatite-rich urtite
Associated Minerals at Type Locality:

Synonyms of Polezhaevaite-(Ce)Hide

Other Language Names for Polezhaevaite-(Ce)Hide

Related Minerals - Nickel-Strunz GroupingHide

3.AB.FluorocronitePbF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.05TolbachiteCuCl2Mon.
3.AB.10CocciniteHgI2Tet.
3.AB.15SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
3.AB.20ChloromagnesiteMgCl2Hex.
3.AB.20Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
3.AB.20ScacchiteMnCl2Trig. 3m (3 2/m) : R3m
3.AB.25FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25FrankdicksoniteBaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25StrontiofluoriteSrF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6F42Trig. 3 : R3
3.AB.35Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6Trig.

Related Minerals - Dana Grouping (8th Ed.)Hide

11.5.6.1Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m
11.5.6.2Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6Trig.

Other InformationHide

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 Polezhaevaite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Yakovenchuk, V. N., Selivanova, E. A., Ivanyuk, G. Y., Pakhomovsky, Y. A., Korchak, J. A., & Nikolaev, A. P. (2010). Polezhaevaite-(Ce), NaSrCeF6, a new mineral from the Khibiny massif (Kola Peninsula, Russia). American Mineralogist, 95(7), 1080-1083.

Internet Links for Polezhaevaite-(Ce)Hide

Localities for Polezhaevaite-(Ce)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
        • Koashva Mt
Yakovenchuk, V.N., Selivanova, E.A., Ivanyuk, G.Yu., Pakhomovsky, Ya.A., Mikhailova, J.A., Nikolaev, A.P. (2010): Polezhaevaite-(Ce), NaSrCeF6, a new mineral from the Khibiny massif (Kola Peninsula, Russia). American Mineralogist, 95, (in press).
Mineral and/or Locality  
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