Mineralogy Database

Zirkelite Mineral Data

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General Zirkelite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Th,Ce)Zr(Ti,Nb)2O7
Help on Composition: Composition: Molecular Weight = 382.76 gm
   Calcium     6.28 %  Ca    8.79 % CaO
   Cerium      3.66 %  Ce    4.29 % Ce2O3
   Thorium     6.06 %  Th    6.90 % ThO2
   Zirconium  23.83 %  Zr   32.19 % ZrO2
   Titanium   18.76 %  Ti   31.30 % TiO2
   Niobium    12.14 %  Nb   17.36 % Nb2O5
   Oxygen     29.26 %  O
             ______        ______ 
             100.00 %      100.84 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.6Th0.1Ce0.1ZrTi1.5Nb0.5O7
Help on Environment: Environment: Found with baddeleyite in decomposed magnetite-pyroxenite. Dimorphous with calciobetafite.
Help on IMA Status: IMA Status: Approved IMA 1960
Help on Locality: Locality: Jacupiranga, San Palo, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ferdinand Zirkel (1838-1912), German petrographer, Professor of Mineralogy, University of Leipzig, Leipzig, Germany.
Help on Name Pronunciation: Name Pronunciation: Zirkelite + Pronunciation Say ZIRKELITE
Help on Synonym: Synonym: ICSD 31198
  PDF 38-450
  Polymignite - metamict
  Uhligite - perovskite or zirkelite (?)
 

Zirkelite Image

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  Zirkelite

Comments: Sub-metallic zirkelite crystal aggregate.
Location: Jacupiranga Mine, Sao Paulo, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Zirkelite

Comments: Black, massive aggregate of zirkelite with minor brown biotite and a thin vein of white calcite.
Location: Palabora Open Pit mine, Loolekop, Phalaborwa, Limpopo Province, Transvaal, Republic of South Africa. Scale: Picture size 1.5 cm.
© Paul M. Schumacher

Zirkelite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 5.05, Z = 2; V = 128.79 Den(Calc)= 9.87
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.98(1), 1.82(0.5), 2.53(0.3),2.84(0.2), 1.51(0.1), 2.3(0.1),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 2 0) ( 1 3 1) ( 0 1 0) ( 1 1 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Zirkelite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Reddish brown.
Help on Density: Density: 4.7
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Radioactive.
Help on Luster: Luster: Resinous
Help on Streak: Streak: brownish gray
 

Optical Properties of Zirkelite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.075 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.559 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1206,KPDmeas= 0.2532,KC= 0.2736
Ncalc = 2.29 - 3.7
Help on Optical Data: Optical Data: Isotropic, n=2.19.
 

Calculated Properties of Zirkelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.33 gm/cc
note: Specific Gravity of Zirkelite =4.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEZirkelite = 212.71 barns/electron
U=PEZirkelite x relectron= 920.97 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 119,140.21 (Gamma Ray American Petroleum Institute Units)
Concentration of Zirkelite per GRapi unit = 8.39 (PPM)

Zirkelite 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) 255.30 ± 63.83 grams of pure Zirkelite .

Estimated Radioactivity from Zirkelite - 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 / 7.41 cm 2,715,916 7.34E-05 119,140.21 39.17
100 gm / 3.44 cm 271,592 7.34E-06 11,914.02 3.92
10 gm / 1.60 cm 27,159 7.34E-07 1,191.40 0.39
1 gm / 7.41 mm 2,716 7.34E-08 119.14 0.04
0.1 gm / 3.44 mm 272 7.34E-09 11.91 0.00
0.01 gm / 1.60 mm 27 7.34E-10 1.19 0.00
0.001 gm / 0.74 mm 3 7.34E-11 0.12 0.00

Weight of pure Zirkelite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.70 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
 

Zirkelite Classification

Help on  Dana Class: Dana Class: 08.02.05.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.02)where (A)2 (B2O6) (O,OH,F)
  (08.02.05)Zirconolite Group
 
08.02.05.01 Zirkelite (Ca,Th,Ce)Zr(Ti,Nb)2O7 F m3m 4/m 3 2/m
 
08.02.05.02 Zirconolite-3O (Ca,Fe,Y,Th)2Fe(Ti,Nb)3Zr2O7 C mca 2/m 2/m 2/m
 
08.02.05.03 Zirconolite-2M CaZrTi2O7 C 2/c 2/m
 
08.02.05.04 Zirconolite-3T CaZrTi2O7 P 312 3 2
 
08.02.05.05 Zirconolite (Ca,Ce)Zr(Ti,Nb,Fe)2O7 None
Help on  Strunz Class: Strunz Class: 04.DL.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DL -With large (� medium-sized) cations; fluorite-type structures
 
04.DL.05 Cerianite-(Ce) (Ce,Th)O2 F m3m 4/m 3 2/m
 
04.DL.05 Zirkelite (Ca,Th,Ce)Zr(Ti,Nb)2O7 F m3m 4/m 3 2/m
 
04.DL.05 Thorianite ThO2 F m3m 4/m 3 2/m
 
04.DL.05 Uraninite UO2 F m3m 4/m 3 2/m
 

Other Zirkelite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Zirkelite :
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
16 - WWW-MINCRYST

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

Zirkelite

(Ca,Th,Ce)Zr(Ti,Nb)2O7
Dana No: 08.02.05.01 Strunz No: 04.DL.05
Locality:

 

Notes:

 

 
   
 


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