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Yttrocrasite-(Y) Mineral Data

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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.
Help on Name Pronunciation: Name Pronunciation: Yttrocrasite-(Y) + Pronunciation Say YTTROCRASITE-(Y)

Yttrocrasite-(Y) Image

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Comments: Polished specimen image showing yellow-orange rhombic sections of prismatic yttrocrasite-(Y) crystals along the fissure in almost black chloritoid aggregate.
Location: Chudnoe Pd-Au deposit, Grubependity lake, Komi Republic, Northern Region, Russia. Scale: Picture Size 4x5 mm.
© Pavel M. Kartashov

Yttrocrasite-(Y) Crystallography

Help on Crystal System: Crystal System: Orthorhombic Space 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 Diaphaneity: Diaphaneity: 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
Ncalc = 2.43
Help on Optical Data: Optical Data: Isotropic, n=2.12-2.15.

Calculated Properties of Yttrocrasite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.45 gm/cc
note: Specific Gravity of Yttrocrasite-(Y) =4.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
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 = 784,723.18 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrocrasite-(Y) per GRapi unit =1,274.33 (PPB)

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
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.36 cm 17,782,964 4.81E-04 784,723.18 257.99
100 gm / 3.41 cm 1,778,296 4.81E-05 78,472.32 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: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.08)Polycrase Group Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DG.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DG -With large (� medium-sized) cations; chains of edge-sharing octahedra
04.DG.05 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m
04.DG.05 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
04.DG.05 Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6(?) Cubic Cubic
04.DG.05 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho
04.DG.05 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
04.DG.05 Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m
04.DG.05 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
04.DG.05 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 04.DG.05





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