Murataite Mineral Data

General Murataite Information

Chemical Formula:

(Y,Na)6(Zn,Fe+++)5(Ti,Nb)12O29(O,F)14

Composition:

Molecular Weight = 2,000.60 gm

Sodium 4.60 % Na 6.20 % Na₂O

Calcium 0.60 % Ca 0.84 % CaO

La,Ce,Pr,Nd,Sm, 8.64 % RE 10.08 % REE₂O₃

Yttrium 9.78 % Y 12.42 % Y₂O₃

Titanium 22.98 % Ti 38.33 % TiO₂

Manganese 0.55 % Mn 0.71 % MnO

Niobium 6.97 % Nb 9.96 % Nb₂O₅

Zinc 9.15 % Zn 11.39 % ZnO

Iron 2.79 % Fe 3.99 % Fe₂O₃

Silicon 0.14 % Si 0.30 % SiO₂

Hydrogen 0.06 % H 0.54 % H₂O

Oxygen 26.63 % O

Fluorine 7.12 % F 7.12 % F

- % F -3.00 % -O=F₂

______ ______

100.00 % 98.88 % = TOTAL OXIDE

Empirical Formula:

Na₄Y_2.2REE_1.2Zn_2.8Fe³⁺Ca_0.3Mn²⁺_0.2Ti_9.6Nb_1.5Si_0.1O_32.1F_7.5(OH)_1.2

Environment:

From a prospect dump in a pegmatite subjected to alkali metasomatism.

IMA Status:

Approved IMA 1974

Locality:

St. Peters Dome area, near Pikes Peak, El Paso County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Kiguma Jack Murata (1909-) Geochemist, U.S. Geological Survey, Menlo Park, California, USA.

Name Pronunciation:

Murataite + Pronunciation

Synonym:

ICSD 81595

PDF 26-1383

Murataite Image

Images:

Murataite

Comments: Murataite (M) crystal in polished section showing cubic, form against quartz (Q). Other minerals are astrophyllite (A) and mineral Y (Y). (AmMin, v59:172).
Location: Small pegmatite in the St. Peters Dome area, El Paso County, Colorado, USA. Scale: See Image.
© American Mineralogist

Murataite Crystallography

Cell Dimensions:

a = 14.886, Z = 4; V = 3,298.63 Den(Calc)= 4.03

Crystal System:

Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: F43m

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

By Intensity(I/I_o): 2.858(1), 1.489(0.8), 1.746(0.8),

Physical Properties of Murataite

Color:

Black.

Density:

4.69

Diaphaneity:

Translucent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Sub Metallic

Optical Properties of Murataite

Gladstone-Dale:

CI meas= 0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2779,KPDmeas= 0.2388,KC= 0.2629
Ncalc = 2.06 - 2.23

Optical Data:

Isotropic, n=2.11-2.13.

RL Anisotrophism:

Weak.

RL Bireflectance:

Slight.

RL Color:

Gray with faint orange internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Murataite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
546 nm	13.70	13.30
589 nm	13.10	12.70
630 nm	12.70	12.30

**Calculated Relative Intensity Colors of Murataite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	700%
R₁
R₂

Calculated Properties of Murataite

Electron Density:

Bulk Density (Electron Density)=3.76 gm/cc
note: Specific Gravity of Murataite =4.03 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Murataite= 85.12 barns/electron
U=PE_Murataite x r_electron= 320.03 barns/cc.

Radioactivity:

GRapi = 8,626.11 (Gamma Ray American Petroleum Institute Units)
Concentration of Murataite per GRapi unit = 115.93 (PPM)

Murataite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Murataite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.80 cm	194,173	5.25E-06	8,626.11	2.84
100 gm / 3.62 cm	19,417	5.25E-07	862.61	0.28
10 gm / 1.68 cm	1,942	5.25E-08	86.26	0.03
1 gm / 7.80 mm	194	5.25E-09	8.63	0.00
0.1 gm / 3.62 mm	19	5.25E-10	0.86	0.00
0.01 gm / 1.68 mm	2	5.25E-11	0.09	0.00
0.001 gm / 0.78 mm	0	5.25E-12	0.01	0.00

Weight of pure Murataite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.03 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.43 % Th) From Sum REE Elements ( 8.64 % REE)

Murataite Classification

Dana Class:

08.07.01.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.07)Dana Type

(08.07.01)Dana Group

08.07.01.01 Murataite (Y,Na)6(Zn,Fe)5(Ti,Nb)12O29(O,F)14 F43m 4 3m

Strunz Class:

04.DF.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DF -With large (ï¿½ medium-sized) cations; dimers and trimers of edge-sharing octahedra

04.DF.15 Murataite (Y,Na)6(Zn,Fe)5(Ti,Nb)12O29(O,F)14 F43m 4 3m

Other Murataite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Murataite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - WWW-MINCRYST

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Murataite

(Y,Na)6(Zn,Fe+++)5(Ti,Nb)12O29(O,F)14
Dana No: 08.07.01.01 Strunz No: 04.DF.15
Locality:

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