Uranmicrolite Mineral Data

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.

Synonym:

Djalmaite

ICSD 27778

PDF 43-693

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Uranmicrolite Crystallography

Cell Dimensions:

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

Crystal System:

Isometric - HexoctahedralH-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

Diaphaniety:

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

Optical Data:

Isotropic, n=1.97.

Calculated Properties of Uranmicrolite

Electron Density:

r_electron=5.21 gm/cc
note: r_{Uranmicrolite}=6.16 gm/cc.

Fermion Index

Fermion Index = 0.00219
Boson Index = 0.99781

Photoelectric:

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

Radioactivity:

GRapi = 1,972,636.34 (Gamma Ray American Petroleum Institute Units)

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	48,987,270	1.32E-03	1,972,636.34	648.54
100 gm / 3.14 cm	4,898,727	1.32E-04	197,263.63	64.85
10 gm / 1.46 cm	489,873	1.32E-05	19,726.36	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:

8.2.2.4 (8)Multiple Oxides with Nb, Ta, and Ti

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

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

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

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

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

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

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

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

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

8.2.2.8 IMA1998-018! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m

Strunz Class:

IV/C.18-80 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.18 - Pyrochlore group, Microlite series with Ta > Nb

IV/C.18-10 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

IV/C.18-20 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-30 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-40 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-50 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

IV/C.18-60 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m

IV/C.18-70 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

IV/C.18-80 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) 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 -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 12 - Uranium Minerals 13 -École des Mines de Paris

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Uranmicrolite

(U,Ca)2(Ta,Nb)2O6(OH)
Dana No: 8.2.2.4 Strunz No: IV/C.18-80
Locality:

Notes: