Yttrocrasite-(Y) Mineral Data + Say YTTROCRASITE-(Y)


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General Yttrocrasite-(Y) Information
Help on Chemical Formula: Chemical Formula: (Y,Th,Ca,U)(Ti,Fe+++)2(O,OH)6
Help on Composition: Composition: Molecular Weight = 298.05 gm
   Calcium    4.03 %  Ca    5.64 % CaO
   Yttrium   14.91 %  Y    18.94 % Y2O3
   Thorium    7.79 %  Th    8.86 % ThO2
   Uranium    7.99 %  U     9.06 % UO2
   Titanium  30.52 %  Ti   50.92 % TiO2
   Iron       1.87 %  Fe    2.68 % Fe2O3
   Hydrogen   0.68 %  H     6.04 % H2O
   Oxygen    32.21 %  O
            ______        ______ 
            100.00 %      102.15 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y0.5Th0.1Ca0.3U0.1Ti1.9Fe3+0.1O4(OH)2
Help on Environment: Environment: Precambrian granites, pegmatites, and metamorphic rocks. A doubtful mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1906
Help on Locality: Locality: Three miles east of Barringer Hill, Llano Co. in Burnet Co., Texas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "mixture", because it is a mixture fo yttrium with many other elements.
 

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Yttrocrasite-(Y) Crystallography
Help on Crystal System: Crystal System: OrthorhombicSpace Group: Unk
 

Physical Properties of Yttrocrasite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.8
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Radioactive.
Help on Luster: Luster: Resinous
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: reddish brown
 

Optical Properties of Yttrocrasite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.204 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2365,KC= 0.297
Help on Optical Data: Optical Data: Isotropic, n=2.12-2.15.
 

Calculated Properties of Yttrocrasite-(Y)

Help on Electron Density: Electron Density:

relectron=4.45 gm/cc
note: rYttrocrasite-(Y) =4.80 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.04064
Boson Index = 0.95936
Help on Photoelectric: Photoelectric:

PEYttrocrasite-(Y) = 397.50 barns/electron
U=PEYttrocrasite-(Y) x relectron=1,768.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 784,722.58 (Gamma Ray American Petroleum Institute Units)

Yttrocrasite-(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) 38.76 ± 9.69 grams of pure Yttrocrasite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 3876.1 ±969.03 grams of pure Yttrocrasite-(Y) .

Estimated Radioactivity from Yttrocrasite-(Y) - strong
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 / 7.36 cm 17,782,956 4.81E-04 784,722.58 257.99
100 gm / 3.41 cm 1,778,296 4.81E-05 78,472.26 25.80
10 gm / 1.58 cm 177,830 4.81E-06 7,847.23 2.58
1 gm / 7.36 mm 17,783 4.81E-07 784.72 0.26
0.1 gm / 3.41 mm 1,778 4.81E-08 78.47 0.03
0.01 gm / 1.58 mm 178 4.81E-09 7.85 0.00
0.001 gm / 0.74 mm 18 4.81E-10 0.78 0.00

Weight of pure Yttrocrasite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.80 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
 

Yttrocrasite-(Y) Classification
Help on Dana Class: Dana Class: 8.3.8.4 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.3)where A (B2O6)
  (8.3.8)Dana Group
 
8.3.8.1 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
8.3.8.2 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
 
8.3.8.3 Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m
 
8.3.8.4 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho
 
8.3.8.5 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.19-20 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.19 - Polycrase-(Y) - Loranskite-(Y) series
 
IV/D.19-10 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
IV/D.19-15 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
 
IV/D.19-20 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho
 
IV/D.19-30 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m
 
IV/D.19-40 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
 
IV/D.19-60 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m
 
IV/D.19-70 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho
 
IV/D.19-80 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho
 
IV/D.19-90 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m
 
IV/D.19-100 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho
 

Other Yttrocrasite-(Y) Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Ford32) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Yttrocrasite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Yttrocrasite-(Y)

(Y,Th,Ca,U)(Ti,Fe+++)2(O,OH)6
Dana No: 8.3.8.4 Strunz No: IV/D.19-20
Locality:

 

Notes:

 
 
   
 
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