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Murataite-(Y)

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About Murataite-(Y)Hide

Formula:
(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
6 - 6½
Specific Gravity:
4.69
Crystal System:
Isometric
Name:
Named in 1974 by John W. Adams, Theodore Botinelly, William N. Sharp, and Keith Robinson in honor of Kiguma Jack Murata [December 29, 1909 - December 27, 2001 Sacremento, Sacremento County, California, USA] geochemist at Menlo Park, U. S. Geological Survey.
Polysomatic pyrochlore-murataite series with modular structure and four structural varieties of murataite (3C, 5C, 7C, and 8C) are described by Laverov et al. (2011).

The structure is a derivative of that of fluorite. The synthetic 8C polytype is a candidate for long-term immobilization of high-level nuclear waste. Its octahedral framework is modular, consisting of alternate murataite and pyrochlore modules to form a transitional substructure combining parts of the struture of the 3C polytype and pyrochlore.


Classification of Murataite-(Y)Hide

Approved
4.DF.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
F : With large (+- medium-sized) cations; dimers and trimers of edgesharing octahedra
Dana 7th ed.:
8.7.1.1
8.7.1.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
18.2.20

18 : Niobates and Tantalates
2 : Niobates and tantalates containing rare earths but not U

Physical Properties of Murataite-(Y)Hide

Sub-Metallic
Transparency:
Opaque
Colour:
Black
Comment:
Dark brown in thin section
Streak:
Dark brown
Hardness:
6 - 6½ on Mohs scale
Hardness:
VHN100=782 - 870 kg/mm2 (15 s test time) - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4.69 g/cm3 (Measured)    4.64 g/cm3 (Calculated)

Optical Data of Murataite-(Y)Hide

Type:
Isotropic
RI values:
n = 2.13
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Reflectivity:
nmR=0 546 (13.7%
nmR=89 (13.1%
nmR=30 (12.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 89 (13.1%.
Pleochroism:
Non-pleochroic

Chemical Properties of Murataite-(Y)Hide

Formula:
(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4
IMA Formula:
(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4
Idealised Formula:
(Na,Y)4(Zn,Fe)3(Ti,Nb)6O18(F,OH)4

Crystallography of Murataite-(Y)Hide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Cell Parameters:
a = 14.836 Å
Unit Cell V:
3,265.51 ų (Calculated from Unit Cell)
Z:
8

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.51 (30)
7.38 (10)
3.414 (10)
3.028 (10)
2.858 (100)
2.468 (60)
2.265 (10)
2.141 (20)
2.080 (20)
1.746 (80)
1.489 (80)
Comments:
Adams et al. (1974)

Type Occurrence of Murataite-(Y)Hide

General Appearance of Type Material:
Anhedral black grains at the contact of astrophyllite and quartz.
Geological Setting of Type Material:
Alkali granite pegmatite
Associated Minerals at Type Locality:

Other Language Names for Murataite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Astrophyllite2 photos of Murataite-(Y) associated with Astrophyllite on mindat.org.
Quartz2 photos of Murataite-(Y) associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.DF.05Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
4.DF.05Aeschynite-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
4.DF.05Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
4.DF.05Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
4.DF.05Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6Orth.
4.DF.05Nioboaeschynite-(Y)(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pban
4.DF.05RynersoniteCaTa2O6Orth. mmm (2/m 2/m 2/m)
4.DF.05Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DF.05Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6Orth.
4.DF.10ChangbaiitePbNb2O6Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.2.1Fergusonite-(Y)YNbO4Tet. 4/m : I41/a
18.2.2Fergusonite-(Y)-βYNbO4Mon. 2/m
18.2.3Fergusonite-(Ce)(Ce,La,Nd)NbO4
18.2.4Fergusonite-(Ce)-β(Ce,La,Nd)NbO4
18.2.5Fergusonite-(Nd)(Nd,Ce)(Nb,Ti)O4
18.2.6Fergusonite-(Nd)-β(Nd,Ce)NbO4
18.2.7Formanite-(Y)YTaO4Tet. 4/m : I41/a
18.2.8Pyrochlore GroupA2Nb2(O,OH)6Z
18.2.9Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.10Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.11Loparite-(Ce)(Na,REE)Ti2O6
18.2.12Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.2.13Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.14Aeschynite-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
18.2.15Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.16Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
18.2.17Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6Orth.
18.2.18Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
18.2.19Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6Orth.

Fluorescence of Murataite-(Y)Hide

Not fluorescent

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 Murataite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1974): 59: 172-176.
Canadian Mineralogist (1995): 33: 1223-1229.
Laverov, N.P., Urusov, V.S., Krivovichev, S.V., Pakhomova, A.S., Stefanovsky, S.V., Yudintsev, S.V. (2011): Modular nature of the polysomatic pyrochlore–murataite series. Geology of Ore Deposits: 53: 273-294; http://forum.amiminerals.it/viewtopic.php?f=5&t=8140 (2016)
Krivovichev, S. V. et al. (2012): Crystal structure of murataite Mu-5, a member of the murataite-pyrochlore polysomatic series. Pp. 293-304 in: Krivovichev, S.V. (Ed.) (2012): Minerals as Advanced Materials II. Springer, Berlin, 427 pp.
Pakhomova, A.S., Krivovichev, S.V., Yudintsev, S.V., Stefanovsky, S.V. (2016):
Polysomatism and structural complexity: structure model for murataite-8C, a complex crystalline matrix for the immobilization of high-level radioactive waste. European Journal of Mineralogy: 28(1): 205-214

Internet Links for Murataite-(Y)Hide

Localities for Murataite-(Y)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
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Buriatia (Buryatia)
        • Mama River Basin
          • Maigunda River
[MinRec 32:42]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA (TL)
 
  • Colorado
    • El Paso Co.
      • Cheyenne District (St. Peters Dome District)
"Minerals of Colorado, updated & revised", p. 338, by Eckel, Edwin B., 1997
Minerals of Colorado (1997) Eckel, E. B.
Mineral and/or Locality  
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