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Iwashiroite-(Y) Mineral Data

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General Iwashiroite-(Y) Information

Help on Chemical  Formula: Chemical Formula: YTaO4
Help on Composition: Composition: Molecular Weight = 313.16 gm
   Calcium      0.13 %  Ca    0.18 % CaO
   Samarium     0.48 %  Sm    0.56 % Sm2O3
   Gadolinium   1.00 %  Gd    1.16 % Gd2O3
   Dysprosium   2.08 %  Dy    2.38 % Dy2O3
   Yttrium     23.00 %  Y    29.20 % Y2O3
   Holmium      0.53 %  Ho    0.60 % Ho2O3
   Erbium       1.60 %  Er    1.83 % Er2O3
   Thulium      0.54 %  Tm    0.62 % Tm2O3
   Lutetium     0.56 %  Lu    0.64 % Lu2O3
   Thorium      0.74 %  Th    0.84 % ThO2
   Ytterbium    2.76 %  Yb    3.15 % Yb2O3
   Uranium      0.76 %  U     0.86 % UO2
   Tantalum    33.51 %  Ta   40.92 % Ta2O5
   Titanium     0.31 %  Ti    0.51 % TiO2
   Niobium     11.57 %  Nb   16.55 % Nb2O5
   Oxygen      20.44 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y0.81Yb0.05Dy0.04Er0.03Gd0.02Lu0.01Ho0.01Sm0.01U0.01Th0.01Ca0.01Tm0.01Ta0.58Nb0.39Ti0.02O4
Help on Environment: Environment: Found in the dumps near the no. 1 pit. Suishoyama mine worked several NYF-type pegmatites. Dimorphous with formanite.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Suishouyama pegmatite, Kawamata town, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the old prefectural name of Fukushima prefecture (Iwashiro).
Help on Synonym: Synonym: IMA2003-053
 

Iwashiroite-(Y) Image

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  Iwashiroite-(Y)

Comments: Polished section of an aggregate of minute iwashiroite-(Y) crystals. Some of the aggregates appear dark blue owing to internal reflections.
Location: Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. (Journal of Mineralogical and Petrological Sciences, v101:170). Scale: See Image.
© JMPS

Iwashiroite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9653:1:0.9374
Help on Cell Dimensions: Cell Dimensions: a = 5.262, b = 5.451, c = 5.11, Z = 2; beta = 95.12° V = 145.99 Den(Calc)= 7.12
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.13(1)(111), 2.95(0.94)(111 ), 1.862(0.29)(022 ),1.89(0.29)(220 ), 2.73(0.26)(020 ), 2.62(0.23)(200 ), 1.614(0.2)(131 ),
 

Physical Properties of Iwashiroite-(Y)

Help on Cleavage: Cleavage: {010} Good, {001} Poor
Help on Color: Color: Amber brown, Brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: pale brown
 

Optical Properties of Iwashiroite-(Y)

Help on Optical Data: Optical Data: NCalc= 2.23 - from Gladstone-Dale relationship (KC = 0.1724) where Ncalc=Dcalc*KC+1
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Iwashiroite-(Y) in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   15.30   14.40 
   
 470 nm   14.10   13.80 
 546 nm   13.80   13.60 
 589 nm   13.90   13.60 
 650 nm   14.00   13.70 
 700 nm   14.30   14.10 
Standardized Intensity (100%) Reflection Spectra of Iwashiroite-(Y) in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm    5.20    5.20 
   
 470 nm    4.40    4.10 
 546 nm    4.50    4.00 
 589 nm    4.80    4.20 
 650 nm    5.00    4.60 
 700 nm    5.90    5.80 
Calculated Relative Intensity Colors of Iwashiroite-(Y) in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 650%
R1                        
R2                        
Calculated Relative Intensity Colors of Iwashiroite-(Y) in Oil
Relative
Intensity
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R1                      
R2                      
 

Calculated Properties of Iwashiroite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Iwashiroite-(Y) =7.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEIwashiroite-(Y) = 569.82 barns/electron
U=PEIwashiroite-(Y) x relectron=3,537.63 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 70,311.67 (Gamma Ray American Petroleum Institute Units)
Concentration of Iwashiroite-(Y) per GRapi unit = 14.22 (PPM)

Iwashiroite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 432.60 ±108.15 grams of pure Iwashiroite-(Y) .

Estimated Radioactivity from Iwashiroite-(Y) - weak
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 / 6.45 cm 1,693,384 4.58E-05 70,311.67 23.12
100 gm / 2.99 cm 169,338 4.58E-06 7,031.17 2.31
10 gm / 1.39 cm 16,934 4.58E-07 703.12 0.23
1 gm / 6.45 mm 1,693 4.58E-08 70.31 0.02
0.1 gm / 2.99 mm 169 4.58E-09 7.03 0.00
0.01 gm / 1.39 mm 17 4.58E-10 0.70 0.00
0.001 gm / 0.64 mm 2 4.58E-11 0.07 0.00

Weight of pure Iwashiroite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 7.12 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
 

Iwashiroite-(Y) Classification

Help on  Dana Class: Dana Class: 08.01.03.03 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.03)Yttroantalalite-Yttrocolumbite Series
 
08.01.03.01 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m
 
08.01.03.02 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho
 
08.01.03.03 Iwashiroite-(Y)! YTaO4 P 2/a 2/m
Help on  Strunz Class: Strunz Class: 07.GA.10 07 - SULFATES (SELENATES, TELLURATES)
  07.G - Molybdates, Wolframates and Niobates
  07.GA -Without additional anions or H2O
 
07.GA.10 Formanite-(Y) YTaO4 I 41/a 4/m
 
07.GA.10 Iwashiroite-(Y)! YTaO4 P 2/a 2/m
 

Other Iwashiroite-(Y) Information

Help on References: References: NAME( AmMin, v91, p1946) PHYS. PROP.(AmMin, v91, p1946) OPTIC PROP.(AmMin, v91, p1946)
Help on See Also: See Also: Links to other databases for Iwashiroite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Iwashiroite-(Y) Specimen Label here :

Iwashiroite-(Y)

YTaO4
Dana No: 08.01.03.03 Strunz No: 07.GA.10
Locality:

 

Notes:

 

 
   
 


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