Mineralogy Database

Uranmicrolite Mineral Data

Search Webmineral :
  
Advertisment

General Uranmicrolite Information

Help on Chemical  Formula: Chemical Formula: (U,Ca)2(Ta,Nb)2O6(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: U0.8Ca1.2Ta1.8Nb0.2O6(OH)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957
Help on Locality: Locality: Fazenda Posse, Brejauba district, Municiop de Conceicao de Serro, Minas Gerias, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for uranium and as a member of the microlite group.
Help on Name Pronunciation: Name Pronunciation: Uranmicrolite + Pronunciation Say URANMICROLITE
Help on Synonym: Synonym: Djalmaite
  ICSD 27778
  PDF 43-693
 

Uranmicrolite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  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

Help on Cell Dimensions: Cell Dimensions: a = 10.4, Z = 6; V = 1,124.86 Den(Calc)= 6.16
Help on Crystal System: 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/Io): 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Greenish brown, Yellow brown, Black.
Help on Density: Density: 5.75 - 5.88, Average = 5.81
Help on Diaphaneity: Diaphaneity: Transparent to Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Octahedral Crystals - Occurs as octahedral shaped crystals.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Highly Radioactive.
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: yellow
 

Optical Properties of Uranmicrolite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.97.
 

Calculated Properties of Uranmicrolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.21 gm/cc
note: Specific Gravity of Uranmicrolite =6.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0021973976
Boson Index = 0.9978026024
Help on Photoelectric: Photoelectric: PEUranmicrolite =1,309.70 barns/electron
U=PEUranmicrolite x relectron=6,822.36 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

Search for Uranmicrolite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Uranmicrolite :

Ask about Uranmicrolite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Uranmicrolite Specimen Label here :

Uranmicrolite

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

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.