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Murataite Mineral Data

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General Murataite Information

Help on Chemical Formula: Chemical Formula: (Y,Na)6(Zn,Fe+++)5(Ti,Nb)12O29(O,F)14
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na4Y2.2REE1.2Zn2.8Fe3+Ca0.3Mn2+0.2Ti9.6Nb1.5Si0.1O32.1F7.5(OH)1.2
Help on Environment: Environment: From a prospect dump in a pegmatite subjected to alkali metasomatism.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: St. Peters Dome area, near Pikes Peak, El Paso County, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kiguma Jack Murata (1909-) Geochemist, U.S. Geological Survey, Menlo Park, California, USA.
Help on Name Pronunciation: Name Pronunciation: Murataite + Pronunciation Say MURATAITE
Help on Synonym: Synonym: ICSD 81595
  PDF 26-1383
 

Murataite Image

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  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
Help on Cell Dimensions: Cell Dimensions: a = 14.886, Z = 4; V = 3,298.63 Den(Calc)= 4.03
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: F43m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.858(1), 1.489(0.8), 1.746(0.8),
 

Physical Properties of Murataite

Help on Color: Color: Black.
Help on Density: Density: 4.69
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Sub Metallic
 

Optical Properties of Murataite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=2.11-2.13.
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: Slight.
Help on RL Color: RL Color: Gray with faint orange internal reflections.
Help on Reflectivity 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.76 gm/cc
note: Specific Gravity of Murataite =4.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEMurataite = 85.12 barns/electron
U=PEMurataite x relectron= 320.03 barns/cc.
Help on Radioactivity: 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
Help on Dana Class: 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
Help on Strunz Class: 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 (� 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
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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:

 

Notes:

 
 
   
 

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