Polycrase-(Y) Mineral Data

Polycrase-(Y) Mineral Data +

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General Polycrase-(Y) Information

Chemical Formula:

(Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6

Composition:

Molecular Weight = 372.96 gm

Calcium 1.07 % Ca 1.50 % CaO

Cerium 3.76 % Ce 4.40 % Ce₂O₃

Yttrium 11.92 % Y 15.14 % Y₂O₃

Thorium 6.22 % Th 7.08 % ThO₂

Uranium 6.38 % U 7.67 % UO₃

Tantalum 14.56 % Ta 17.77 % Ta₂O₅

Titanium 15.41 % Ti 25.70 % TiO₂

Niobium 14.95 % Nb 21.38 % Nb₂O₅

Oxygen 25.74 % O

______ ______

100.00 % 100.64 % = TOTAL OXIDE

Empirical Formula:

Y_0.5Ca_0.1Ce_0.1U_0.1Th_0.1Ti_1.2Nb_0.6Ta_0.3O₆

Environment:

Granitic pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Rasvag, Hidra (Hittero) Island, near Flekkefjord, and many other places in Norway. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "many" and "mixture", in reference to the large number of chemical elements in the formula.

Synonym:

ICSD 89029

PDF 46-1458 (U)

Polycrase-(Y) Image

Images:

Polycrase-(Y)

Comments: Large, black, blocky polycrase-(Y) crystal.
Location: Hidra, Vest-Agder, Norway. Scale: Crystal size 0.8 X 2.0 cm.
© John Veevaert

Polycrase-(Y) Crystallography

Axial Ratios:

a:b:c =0.3796:1:0.3549

Cell Dimensions:

a = 5.55, b = 14.62, c = 5.19, Z = 4; V = 421.12 Den(Calc)= 5.88

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcan

Forms:

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Forms: [ 0 1 0] [ 2 0 1] [ 1 1 1] [ 1 1 0] [ 1 0 0]

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Physical Properties of Polycrase-(Y)

Cleavage:

None

Color:

Black, Brown.

Density:

4.97 - 5.04, Average = 5

Diaphaniety:

Subtranslucent to Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent and radioactive.

Luster:

Vitreous - Resinous

Magnetism:

Nonmagnetic

Streak:

brown

Optical Properties of Polycrase-(Y)

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.119 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KPDmeas= 0.2498,KC= 0.2412

Optical Data:

Isotropic, n=2.25.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Polycrase-(Y) in Air**
λ	R	∑ R(λ)
470 nm	15.60
546 nm	14.60
589 nm	13.40
650 nm	13.90

**Calculated Relative Intensity Colors of Polycrase-(Y) in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	640%
R

Calculated Properties of Polycrase-(Y)

Electron Density:

r_electron=4.47 gm/cc
note: r_{Polycrase-(Y)}=5.01 gm/cc.

Fermion Index

Fermion Index = 0.02053
Boson Index = 0.97947

Photoelectric:

PE_{Polycrase-(Y)}= 538.58 barns/electron
U=PE_{Polycrase-(Y)} x r_electron=2,405.32 barns/cc.

Radioactivity:

GRapi = 603,860.03 (Gamma Ray American Petroleum Institute Units)

Polycrase-(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) 50.37 ± 12.59 grams of pure Polycrase-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5037.0 ±1259.3 grams of pure Polycrase-(Y) .

**Estimated Radioactivity from Polycrase-(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 / 7.25 cm	14,211,312	3.84E-04	603,860.03	198.53
100 gm / 3.37 cm	1,421,131	3.84E-05	60,386.00	19.85
10 gm / 1.56 cm	142,113	3.84E-06	6,038.60	1.99
1 gm / 7.25 mm	14,211	3.84E-07	603.86	0.20
0.1 gm / 3.37 mm	1,421	3.84E-08	60.39	0.02
0.01 gm / 1.56 mm	142	3.84E-09	6.04	0.00
0.001 gm / 0.73 mm	14	3.84E-10	0.60	0.00

Weight of pure Polycrase-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.01 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

Polycrase-(Y) Classification

Dana Class:

8.3.8.1 (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

Strunz Class:

IV/D.19-10 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 Polycrase-(Y) Information

References:

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

See Also:

Links to other databases for Polycrase-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - Uranium Minerals

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

Polycrase-(Y)

(Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6
Dana No: 8.3.8.1 Strunz No: IV/D.19-10
Locality:

Notes: