Murataite-(Y) (original) (raw)

Formula:

(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4

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.

Long-form identifier:

mindat:1:1:2811:6

3ae748d5-1d68-4950-b356-45ab3c893101

IMA Formula:

(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4

Type description reference:

Adams, J.W., Botinelly, T., Sharp, W.N., Robinson, K. (1974) Murataite, a new complex oxide from El Paso County, Colorado. American Mineralogist, 59, 172-176.

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

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

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Comment:

Dark brown in thin section

Hardness:

VHN100=782 - 870 kg/mm2 (15 s test time) - Vickers

Density:

4.69 g/cm3 (Measured) 4.64 g/cm3 (Calculated)

Birefringence:

Isotropic minerals have no birefringence

Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 13.7%.

Colour in reflected light:

Gray, darker in oil

Internal Reflections:

Faint orange in air. Conspicuous and pale orange to white in oil.

Comments:

Slight in air, but distinct in oil.

Mindat Formula:

(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4

Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 14.836 Å

Unit Cell V:

3,265.51 ų (Calculated from Unit Cell)

Comment:

Space Group: F43m

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005476	Murataite-(Y)	Ercit T S, Hawthorne F C (1995) Murataite, a UB12 derivative structure with condensed Keggin molecules The Canadian Mineralogist 33 1223-1229		1995	0	293

CIF Raw Data - click here to close

General Appearance of Type Material:

Anhedral black grains at the contact of astrophyllite and quartz.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 133319–133321.

Geological Setting of Type Material:

Alkali granite pegmatite.

Associated Minerals at Type Locality:

Reference:

Adams J W, Botinelly T, Sharp W N, Robinson K (1974) Murataite, a new complex oxide from El Paso County, Colorado. American Mineralogist 59, 172-176

Associated Minerals Based on Photo Data:

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.