Uranmicrolite Mineral Data

General Uranmicrolite Information

Chemical Formula:

(U,Ca)2(Ta,Nb)2O6(OH)

Composition:

Molecular Weight = 695.81 gm

Calcium 6.91 % Ca 9.67 % CaO

Uranium 27.37 % U 31.05 % UO₂

Tantalum 46.81 % Ta 57.16 % Ta₂O₅

Niobium 2.67 % Nb 3.82 % Nb₂O₅

Hydrogen 0.14 % H 1.29 % H₂O

Oxygen 16.10 % O

______ ______

100.00 % 102.99 % = TOTAL OXIDE

Empirical Formula:

U_0.8Ca_1.2Ta_1.8Nb_0.2O₆(OH)

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Fazenda Posse, Brejauba district, Municiop de Conceicao de Serro, Minas Gerias, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named for uranium and as a member of the microlite group.

Name Pronunciation:

Uranmicrolite + Pronunciation

Synonym:

Djalmaite

ICSD 27778

PDF 43-693

Uranmicrolite Image

Images:

Uranmicrolite

Comments: lack crystals of (most probably) uranmicrolite [originallly labeled samarskite-(Y)) in purple lepidolite matrix.
Location: Brown Derby Mine, Ohio City, Quartz Creek District, Gunnison Co., Colorado, USA. Scale: Specimen Side 3x3x2 cm.
© John Betts - Fine Minerals

Uranmicrolite Crystallography

Cell Dimensions:

a = 10.4, Z = 6; V = 1,124.86 Den(Calc)= 6.16

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.552(1), 1.818(1), 2.95(1),0.995(0.8), 1.054(0.8), 1.154(0.8), 1.183(0.8), 2.55(0.8),

Physical Properties of Uranmicrolite

Cleavage:

None

Color:

Greenish brown, Yellow brown, Black.

Density:

5.75 - 5.88, Average = 5.81

Diaphaneity:

Transparent to Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

5.5 - Knife Blade

Luminescence:

Highly Radioactive.

Luster:

Greasy (Oily)

Streak:

yellow

Optical Properties of Uranmicrolite

Gladstone-Dale:

CI meas= -0.095 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1575,KPDmeas= 0.1668,KC= 0.1523
Ncalc = 1.88 - 1.94

Optical Data:

Isotropic, n=1.97.

Calculated Properties of Uranmicrolite

Electron Density:

Bulk Density (Electron Density)=5.21 gm/cc
note: Specific Gravity of Uranmicrolite =6.16 gm/cc.

Fermion Index:

Fermion Index = 0.0021973976
Boson Index = 0.9978026024

Photoelectric:

PE_{Uranmicrolite}=1,309.70 barns/electron
U=PE_{Uranmicrolite} x r_electron=6,822.36 barns/cc.

Radioactivity:

GRapi = 1,972,637.55 (Gamma Ray American Petroleum Institute Units)
Concentration of Uranmicrolite per GRapi unit = 506.94 (PPB)

Uranmicrolite 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) 15.42 ± 3.85 grams of pure Uranmicrolite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1541.9 ±385.48 grams of pure Uranmicrolite .

**Estimated Radioactivity from Uranmicrolite** - very 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 / 6.77 cm	48,987,279	1.32E-03	1,972,637.55	648.54
100 gm / 3.14 cm	4,898,728	1.32E-04	197,263.76	64.85
10 gm / 1.46 cm	489,873	1.32E-05	19,726.38	6.49
1 gm / 6.77 mm	48,987	1.32E-06	1,972.64	0.65
0.1 gm / 3.14 mm	4,899	1.32E-07	197.26	0.06
0.01 gm / 1.46 mm	490	1.32E-08	19.73	0.01
0.001 gm / 0.68 mm	49	1.32E-09	1.97	0.00

Weight of pure Uranmicrolite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.16 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

Uranmicrolite Classification

Dana Class:

08.02.02.04 (08)Multiple Oxides with Nb, Ta, and Ti

(08.02)where (A)2 (B2O6) (O,OH,F)

(08.02.02)Pyrochlore Group (Microlite Subgroup; Ta>Nb;(Ta+Nb)>2(Ti)

08.02.02.01 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

08.02.02.02 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

08.02.02.03 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

08.02.02.04 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

08.02.02.05 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

08.02.02.06 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

08.02.02.07 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

08.02.02.08 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m

Strunz Class:

04.DH.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DH -With large (� medium-sized) cations; sheets of edge-sharing octahedra

04.DH.15 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

04.DH.15 Betafite (Ca,U)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6•(H2O) F d3m 4/m 3 2/m

04.DH.15 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m

04.DH.15 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Jixianite Pb(W,Fe)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6•(H2O,K) F d3m 4/m 3 2/m

04.DH.15 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

04.DH.15 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m

04.DH.15 Plumbobetafite (Pb,U,Ca)(Ti,Nb)2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Stibiobetafite (Sb,Ca)2(Ti,Nb,Ta)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)•n(H2O) F d3m 4/m 3 2/m

04.DH.15 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m

04.DH.15 Yttrobetafite-(Y) (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

04.DH.15 Elsmoreite! WO3•0.5(H2O) F d3m 4/m 3 2/m

Other Uranmicrolite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Uranmicrolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Uranmicrolite

(U,Ca)2(Ta,Nb)2O6(OH)
Dana No: 08.02.02.04 Strunz No: 04.DH.15
Locality:

Notes:

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